Actually I think it's a VERY good thing that Amazon sedt these themselves. Why? Because look at eBay. WAY too many people on there OVERCHARGE by a colossal amount just to avoid fees.
Not sure what these restrictions on how much you sell for are? What do you mean?
Ah, maybe I know. For things like mobile phones, you have to be what they call an "Approved Seller" before you sell the more recent mobiles. Maybe THAT is the restriction you mean. By the way, don't confuse the Amazon Associates affiliate progreamme with what I am talking about. Now THAT is something I have tried tried and TRIED without earning a single PENNY from. In fact, I've only had about three clicks in 3 years plus!! Why doesn't it work for me? No idea!