What kind of economy is that where there is always some one willing to buy what you are selling. That is totally illogical. I have some magical beans for sale...wanna buy them?
That's called capitalism. Ever heard of garage sales? Flea markets? Those are places where people will buy used dishes, forks, cups, bowls, pitchers, ect. for money. Will it be alot of money? No. Will it be money? Yes, most likely a quarter or less which is about 1 gp in Oblivion. And what about that one store in the Imperial city run by the bosmer that sold goods for cheap? His store was the kind of place that would buy used goods for a low price. Used dishes and such have a value to people that have no such things and are too poor to afford new ones. Those are the kind of people that would buy them, the bosmer would have made a killing by buying used items like that on the cheap and selling them at a slightly higher price to those who couldn't afford new ones (we all know what he did instead but still). Same principle as thrift stores or places like gamestop. If items useless items had value it would feel more like the world was real, complete with second hand stores. I'm not worried about this for Skyrim, I'm pretty sure Bethesda knows what they're doing and the game's economy system is being worked on so it should work out fine, and if not I'm not gonna let it bug me.