One option for eBay maybe to have a seller charged 50% of a non selling price for an item advertised or 5% of the final sale price. That would sort out the sellers just trying to make HUGE profits on cheap items.

I, for one, as a buyer, if looking to buy something here, look through every page for the cheapest item so its irrelevant what page your item shows up on the buyer will see it. Also, a niche market like the one you are trying to sell into only has a certain amount of buyers who after buying the item really have no need to look for another one.