So I have a list of sets that I want to collect over time. I do not want to pay more than the market value according to this site though. Why is it that people are posting NIB sets on ebay for WAY more than the market value? Do they expect to sell them for that, because obviously they don't sell. The best thing to do would be to let people bid and see how high it goes. I don't think anyone is going to pay 1500 bucks for something whose market value new is only 350. I'm sure this has been discussed before, but it just seems so illogical to try to get hundreds more than something is worth. I know it's been going on for years but ...yeah...I don't get it.

You shouldn't be looking at what others are asking for a particular set. Look at what price actually sold sets achieved. You can select 'sold items' in ebay search.

Many of the complaints here are for when a seller has the only item and then the list it for far above the "market" price. If they are the only ones selling it, they ARE the "market" there is nothing else to compare it to except past sales which are invalid comps. If I owned a one of a kind item, I would make it my duty to get every cent I could out of it since that is what I am here to do - make money. If anyone here makes money off a set by selling it, they are all the same, they are trying to generate profits, some are just better at it than others.