Basically, for the guild you create, it's a group of more or less closer than average people, right? So how about someplace where people who don't care about sales, auctions, achievements, or whatnot can put past gear to be used by other players? Of course, there's the issue of unbinding...

It needs technical work if it were to ever even be thought of being implemented. But I thought it had potential (or I'd not have posted it here).