oh and also, selling stuff on the market only works if you buy stuff off the forums, and are willing to wait like 300 million years for it to sell.
Items that are expensive and never sell on the market are good examples. People put them up for low prices just to get rid of them, and then if you want and can actually forsee the price not dropping or other people putting lower prices then you then go ahead and wait forever.

Pretty useless if I say so myself, and I haven't done any real marketing in over 6 months.