No the laws of economics wont apply as well in this game as they do in the real world. I cant go out and kill something to make a few bucks just on a whim like I can in the game 8) , just as I cant run quests for said monies. Yes even though these 12 year old kids dont know it, they are in fact following the laws of economics. We do it without thinking. You got your item returned back cause nobody wanted to spend that much? You put it up again at the same price hoping someone will, or you lower it. That is economics. You are right, people are greedy. As I said earlier, this is not necessarily a bad thing. In the game world it can hurt us even more than the real world though, as benefits are not as easily noticeable.
After all, greed is what makes the world go round. If nobody was greedy, then there would be no specialization and we'd all be farmers and hunter gatherers ^^.
Faedryth