I think it's a seriously bad idea. You're messing with a basic, core mechanic that defines and separates Wizards from Sorcerers. Why, exactly, would you want to limit the number of spells a Wizard knows and force him to buy equipment? You're going to end up with a shallow, one-trick-pony Wizard who casts the same few spells over and over and over and over again, simply because he's only been able to acquire a few good spells... in other words, a Sorcerer.
Yes I am messing with the basic mechanic, that's why I came on this forum to see if people much smarter than me can give me actual reasons why it might be a bad idea and what suggestions they can make as to how to improve my idea. Also, the major thing that has defined wizards from sorcerers has been (and will continue to be) spontaneous vs prepared casting as well as their school/bloodline powers. Why would I want to limit the power of wizards? Because it outshines EVERY OTHER CLASS IN THE GAME. When someone is talking about the best build for just about anything they have to at least consider if a wizard can do it as well as any combination of classes, variants, bloodlines, templates and feats. If a wizard can do that then I think they need to be re-addressed. Pathfinder made good strives at making all other classes more powerful but I think that fails to address the root problem.
You're idea would be robbing the player of the Wizard of one of the primary, elemental experiences of playing a Wizard: assembling your spellbook and choosing your spells for the day. That isn't a thing you approach simply or without thought, it is a very very strategic process and can be a very fun part of the game. I know it always is for me and my friends who love to play Wizards.
If anything it enhances the need to build their spellbook. They must actually go out, research, buy the scrolls needed in order to learn the spells in their book. As it is, they get 2 spells per level and there is virtually no effort involved except when a tough choice must be made of which spells to get this level and which to get next level.
There already IS a class that knows only a few spells and casts those over and over and over, and it's called the Sorcerer. If, for some reason, you think that Wizards get too many spells in their spellbooks, then eliminate the Wizard class and make everyone who wants to play a Mage play a Sorcerer. Don't muck them up and unbalance Wizards in relation to Sorcerers.
I think forcing wizards (and sorcerers) to pay for thier spells like a fighter pays for his equipment means that they won't be picking up spells that are useless and that they won't have the cash to buy a spell for EVERY contingency. They'll have to decide if their money should go toward knock or fireball.
There s a big, big reason for the differences between Wizards and Sorcerers, why Sorcerers get a few spells they can cast all day long but Wizards get a fewer number of spells they can cast each day but can amass a huge library of spells in their books to choose from. I have seriously NEVER encountered a problem because a Wizard "knew too many spells." Seriously, you could let Wizards know EVERY spell of a certain level, just like Clerics already do, and it seriously wouldn't impact balance or make him much more powerful because he can still only PREPARE a few of them at once.
Okay, couple of things I object to here.
First, the benefit of sorcerers is that they are spontaneous and can cast all their spells all day long. Yes there is more incentive for them to go learn spells so they have more choice but the direct benefit is the same.
Second, in my proposal BOTH wizards and sorcerers must buy any spells beyond the first free spell they get per spell level.
Third, I HAVE seriously encountered a problem with wizard knowing too many spells. I have had that same issue with clerics and so far I have no simple remedy beyond insituting a similar learning rate that wizards have.
Fourth, if a wizard can prepare ANY spell they want and there is no real balance issue that only underlines my point of them knowing too many! They have too many contingencies, options, spell lists.
If you do what you propose to Wizards you should also limit Fighters to only owning a few weapons, too, because it is the same thing; a Fighter can own every damn weapon in the book but it doesn't give him any advantage because he can still only use one (possibly two) at a time.
This is probably my favourite and illustrates my point. Fighters get 1 feat per 2 levels (approx). They get an extra one at first level and I'm sure something like that could be affording to wizards. (They also get bonus stuff in pathfinder, but so do specialist school wizards.) Wizards CAN own every damn spell in the book but it is going to cost them just as it would cost a fighter owning every damn weapon in the book. The difference is, that fighter gains only a limited benefit from that weapon they pick up unless they pay the extra cash to get a better one. Similary, a wizard should pay more to get better and better spells, in scroll form, to copy into their spellbook.
I'm sorry, I don't mean to come off as snippy or a prick, but amassing a large library of spells and making the strategic decisions each day of what spells to prepare is one of the basic pleasures of playing a Wizard, one of the reasons why I love playing them, my favorite class, and you're idea would be robbing them of that.
YOU STILL CAN. That is the nice thing about my rule. All spells will be available in scroll form for the wizard (and sorcerer) to pick up. They'll still learn others for free but if they want to go out and buy more then all the power to them. I realize you might be upset because I'm picking on your favourite class, but as they are not mine I hope you can understand my feeling they are very much stronger than the average class.
Hell, when I'm playing a Wizard I'll make up several daily spell lists, an Offensive list, a Defensive list, and a Utility list, maybe two or three variants of each, have those lists ready and swap out a spell here and there as needed for specific needs that are foreseen to further perfect a spell list for each day. There is a lot of strategic thinking and looking ahead for the Wizard, and that's a lot of the fun of playing them.
And? How would this change? Do you think it will change because they only get 1 spell per spell level for free? That would only be the case if a wizard doesn't want to invest their time and money into learning more. In game I would assume that they can learn many of these spells from a local mentor, wizards college, arcane library, archaic scrolls in a dungeon. Anywhere they are willing to spend the effort learning that spell and putting into their spellbook. I would just not give it to them just because they happened to level. Especially when they have the option to learning additional spells from all the sources I just listed ALREADY by the existing rules.
What you propose is a good way of turning the Wizard into a crippled version of the Sorcerer, but not much else. If you really think Wizards end up knowing too many spells, which I still can't wrap my head around, then eliminate the class and just push Sorcerers in place of them, but please don't mangle them like you propose. They're the way they are for a reason.
I don't want sorcerers in place of wizards. I have played both and there are certainly roles for both and personalities for both. I think this is a silly thing to say (if the mods will allow) as I did originally say that sorcerers would be treated the same and lose all but 1 spell per spell level for free. Sorcerers would also get the spells a level later, but that is the drawback of spontaneous casting.
I don't think it is a good idea, but if it works for your game then go for it.
I don't think that wizards get too many spells to start with. Even with a large number of spells in their spellbook they are still limited to a certain number per day which still acts as a limiter.
Well the thing, and why I posted about it here, is that I have no idea if it would work out well in my game. I realize it severely limits the power of wizards (and sorcerers) but if the ONLY it realistically changes is how strong wizards are then good. I can try it out then and get back to you.