tbh i found that almost anything sells, if offered at the right price...
location is important aswell. Some vendors attract more new players - so offer wares that suit them.
Some locations are mainly deco, then some others attract different stuff.
Economy of a computer game = no different then the one in real life. Location, Location, Location.
Feed off your competitors, and if you really want to make a buck - buy smart, sell twice as smart
Economy is a game by itself
Even dressing your vendor has an impact. Like how advertisements with cleavage get mens attention. It's old, but IT WORKS :p
Even certain colors spice up your 'lust' to buy...
putting up a vendor in a row of 50, it's no surprise that by vendor 40 allot of people have lost their attention.
Endless bags inside other bags (and so on) with awesome stuff.... doesn't work. Pricing, adding a description if necessary (pets), it's all important.