Obviously, on average vendors don't sell an item "at cost".
Actually they do. Otherwise would you like to explain why the cost for a level 1 magical item with the enchant item ritual is identical to one made in a store? I mean, they don't produce it out of thin air and if your PC can make it using the *same* ritual, why is it they can do it far cheaper than your PC can?
So "obviously" magic items are sold pretty close to what their made for, because the market is small (adventurers are extraordinary people, not your average peasant) and there is a big investment in making magic items for such a limited market. Hence the more rare the more valued.
And that's precisely the system we're working on.
But, for the sake of argument, let's say you're right and they sell a level 1 magic item for the same price it costs them to procure - which means it costs them 360gp normally to procure such an item. That means that any price below 360gp is actually a good deal for them - they're getting the item cheaper than usual!
Yes, for a far smaller and niche market. We're not talking about the Forgotten Realms where peasants are so bored they have nothing better to do than buy vorpal scythes of wheat cutting +6 and pitchforks of stabbing +6.
after all it's a common item, and every magic item shopkeep deals in them since every combatant or adventurer with sufficient resources will want one.
Which is an extraordinarily niche market. Considering as well common items can be made by anyone: Someone with enough resources won't buy items from a merchant.
They will make their own.
If it's easy to find a buyer and hard to procure
That's precisely the situation with rare items, but not common items. It is hard to find a buyer but it is easy to get common items.
Common magic items don't degrade over time (both mechanically and mythically), so the argument that the item is "used" hardly matters.
Common items are easy to manufacture and produce, they have a low market though making them far less valuable. Selling a merchant something that is easy to make themselves, presumably however they do it cheaper than PCs (see the point about the enchant ritual) is going to lead to a lesser sell price to them. They'll take it, but it's not special or interesting - given this is a niche market to begin with there is no logic suggesting they would buy it anywhere near where they sell it.
For example I sold some DVDs to Cash Converters. I paid $30 NZ. DVDs are very common (I am sure you'll agree). For some reason, they didn't give me $30 NZ for them! They gave me $5 for them. I mean, according to your utterly zany logic they should be giving me $30 for them - but that's not how reality actually works.
On the other hand I sold a very rare model that I had when I was a kid to a pawnbroker. It's immensely rare and hard to get, so what I got for it was almost $300 NZ for something that cost me $7.50 when I was a kid.
Merchants aren't going to pay less for rare, powerful magical items that they rarely see. They aren't going to give you the same price for items they manufacture and sell trivially that they can easily get.
Your argument fails to make any sense whatsoever.
vagabundo said:
I believe he is arguing that the Rare items will be hard to shift so a buyer will only offer 20% and the common items will be easy to shift
His argument makes zero sense. Rare items are powerful and highly desired in DnD worlds. How many quests come down to finding ancient artifacts and lost items? Look at Morgrave University in Eberron, that routinely funds expeditions into the heart of Xen'drik looking for stuff the giants left behind. Do you think a +1 longsword is going to interest them over a long lost item whose secrets to manufacture have been completely lost?
I mean,
really?
Really?
Heck, even the Forgotten Realms has a history of delving into long lost places to find better artifacts and lost knowledge. So it even applies to the world with +6 vorpal pitchforks. Especially when making said items isn't actually possible and magical items make a huge difference to your power. As I mentioned above, people will pay more for what is actually harder to get in reality - not what is common.
Common items are a nice market as it is. But rare powerful items are rather like having the better, more superior weapons that give you a distinct advantage over your competitors. If you have the latest artifact of doom to research, you're getting a big leg up over everyone else using common items because we already know that rare weapons aren't just magic things -
they are BETTER magic things. A merchant can almost certainly find something who wants to buy a rare, unique artifact that will vastly improve said individuals power or status. Does that same merchant really want another +1 longsword onto the pile of +1 longswords he already has?