I believe it's possible to 'fix' the uncommon market, you put in several hundred bids at 5,000, and put all your sales back in at 25,000 or so, then do the same at 10,000, and put them back in at 50,000, just keep doing something like that, but I think the returns are low enough it isn't worth it. You'd make several million here and there, I guess the effort is pretty low compared to crafting recipes etc, maybe that's the appeal?