Not that this is the focus of this thread, but I can think of lots of reasons that magic item shops aren't realistic.
- Lack of information/communication. You inherited a longsword +1 from your dad, but how do you get it to someone who wants it? How do you get its worth? There's no ebay, the roads are dangerous, and chances are you live in a small village. Matching buyers with sellers becomes a huge stumbling block, in the same way that before ebay it was almost impossible to find quirky rare old items that you wanted to buy.
- Slow turnover. A shop keeper needs a relatively fast item turnover to make money, or needs to pad her margins by a large amount to compensate for slow turnover. Unless you're in a huge city or a place rife with adventurers and easy money, like a boom town, items are going to sit for a long time until they're sold.
- No immediate payoff. No shop owner wants to pay lots of gold up front, then hope an item will sell. A more likely approach are magic item brokers, people who match up buyers and sellers and take a commission.
- Theft. Open up a magic item shop, and you have every thief and poor adventurer panting at your locked-up door. That means you need to pay for security, and GOOD security. Insurance doesn't exist.
Huh. This litany has convinced me to add magic item brokers to my big cities, sly people in the know who match up their customers. No inventory problems, no theft problems, and it solves the problem of matching buyer and seller. Also, it'll take a day to a month to get any given item once it's ordered. Works for me.
Every single one of those concerns is faced by Pawn Shops the world over and yet they somehow manage to stay open and make money. You think a curio shop doesn't have a few +1 weapons lying around (that they know how to identify) inherited by children of adventurers who just want to be Inn owners? Of course they do. Buy low (say 50% market rate as suggested by the PHB), sell high. Yes some capital is tied up in inventory, but that doesn't stop the shop from making money.
Magic Items by consignment fee still need somewhere to be displayed, or someone to make the deal. The shops exist. To remove them from existance to try and break the model of "use +1 swords to earn +2 swords" is just not realistic. A world where magic exists has magic worked into it's economy. It would follow naturally from "magic exists". There are even guidelines for spell services in the PHB, so there's a basis for magic as a trade good or service already.
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