I'm a hoarder, not a seller, lol, so opening a trading stall/table wouldn't do me any good, because I just want to acquire more toys, not part with any of the ones that are already in my collection.
I agree that it seems like most people, even little old Grandmas, know that they can get $$$ for figures on eBay these days, so they don't donate them to thrift stores in the quantities that they used to.
That said, I actually do find some great stuff at thrift stores, even Marvel Legends. The thing is, you have to go all the time, everyday almost, as their stock changes and moves quickly. That's the rub--you almost have to live there.
@Pock63: The thought of volunteering as a sorter has crossed my mind, but, ethically, I think it'd be wrong for me to do that, because the only reason I'd be doing it is for the ulterior motive of getting first crack at their toy donations, not because I honestly wanted to help the store/staff out, and that'd be kind of sleazy (the one I frequent most often is a St. Vincent de Paul Society thrift store, and thus, a Catholic establishment, so, God would punish me!)