I was referring to 5ekyu saying they aren't worth much because you get free ones. I can see that to a certain extent but I can also see higher level spells being very valuable because of their rarity. In general, there are less high level casters who have those spells, so finding all the spells you want by the time you are higher level - even with your free spells - could be difficult and could increase the price. If you have ye 'old magic shop selling spell books with 7-9th level spells, then a random spell book won't be worth much.
It's like Scotch. The older, rarer scotches are worth lots of money, especially if the distillery doesn't exist anymore. So, maybe, Time Stop was known by a wizard two-hundred years ago. Where is his library? Who owns it now?
Yeah, I agree with this to a certain extent. You might need Mind Blank RIGHT NOW because you just pissed off that Demon Prince and now his minions are hunting you and scrying you. Suddenly that spell becomes very, very valuable to you. (Once again, Supulchrave's story-hour demonstrated this very well) I think there's more value in trade when it comes to spellbooks anyways. I'll trade you this spell that you don't have for this spell that I need. But maybe that other wizard is a rival and doesn't trust you and barters a magic item out of the deal - or whatever.
For non-spellcasters, trading a book for a service might be better.
"I was referring to 5ekyu saying they aren't worth much because you get free ones. I can see that to a certain extent but I can also see higher level spells being very valuable because of their rarity."
Ok so since that is to me, consider this.
First, I acknowledged there were opportunity buyers - specific people with specific needs for specific spells now. Sure, there will be those - similar to finding someone who has all but one of a common piece of a collection an wants it. If they can just get that last item on Ebay for free pick-up a month from now, they are not likely to be willing to pay a lot now - the free spells per level is like that.
Second, you mentioned scotch after distillery is out of business and that in your game you block out certain spells from level selection - that would also create for those particular items a value sure, but in the absence of the house rules - those factors dont exist.
Third, you mention that of one just took the free spells that would be "underwhelming" or some such, but in comparison to what?
Maybe you meant comparing to other arcane class casters? In fact that's like 44 spells over a 20 level wizard run (ignoring cantrips and feats may change that slightly. That's like triple the spells known of the sorc for instance. That also ignores spells added found from scrolls. I would suggest to you that the wizard class even without a single spell from a found or bought spellbook is still a very potent and strong character, easily on par with the others.
Maybe you mean in comparison to other wizards? That's a catch-22. If its underwhelming, that means there is a more common normally "whelming " level of spells - where did they get them? If there is a commonly available source that many others got extra spells from that was cheap enough and reliable that they could afford it on top of the scribing cost **and** that it produced a sufficient increase in needed spells in spellbooks then that source itself devalues you sprllbook-4-sell/rent. the spellbook someone wants to sell is valued at a low cost because of that other resource being so commonly available that it makes your own wizard's 44 spells or whatever disappointingly small.
So, again, it seems more of an opportunity market , happening to find someone who wants that specific spell now - who has that money to spare.
But I did not say they had no value. Just that it would be minimal, a small percentage of their available wealth - a convenience buy.
Put another way, the mechanics would seem to put it as a disposable income purchase - outside of those opportunity buyers. That's far from the trope of wizard spellbooks being highly valued items **by others.**
On the other hand, the basic 5e rules do setup a major lucrative market for spellbooks - a ransom market.
A spellbook is a massive financial investment to its creator. Except for conjurers, loss of a spellbook is a massive loss of power (until replaced) and costs a lot of time and money to replace. So, the "money" in acquiring spellbooks is in transforming them back to their non-conjurers creators, not to strangers who might have a passing interest.
The other financial gain would be acquiring a living wizard's spellbook for hire to weaken the wizard temporarily, perhaps as a service to his enemy.
Now, as you mentioned for your campaign, a set of setting specific rules or house rules that put some spells into different categories can put them at more valuable tiers than others.
If a GM wanted he could house rule that copying from another wizards spellbook was cheaper than copying from scrolls. That would make it similarly valuable for those who sought additional spells.
Making the automatics cost and the copies cost less (by saying it's already figured out) even if you make copying take more time - that would establish a measurable value.
But absent those kinds of house rules or setting specific elements such as an organization that creates a baseline market (perhaps by buying spellbooks based on a formula they defined) or themselves providing a resource for purchasing access it's just a one-on-one convenience/opportunity market setup. Absent those changes to the mechanics, the time and cost is all on the
Spellbook ransom tho, that's a very different thing.
And your answer to the other poster shows the opportunity buyer quite well.