I see what you're saying, I really do,

But I can't be buyer AND seller...

I never list something for sale unless I know what a FAIR price is , how many times have we overpaid for something just because it was more convenient than waiting?
In the past I've bought pins from sellers who listed at what I PERSONALLY thought was cheap, and when I offered more they politely refused, because I was paying What THEY were asking,

I think alot has to do with the Sellers character

I'm picking up a pin tomorrow from a seller who had this pin listed on Marketplace for over a week at what I consider a good deal, no one noticed, I offered very close to the asking price, I don't feel the least bit bad, I'm very happy as is the seller

Having it turn into an auction sucks, and that has happened to me too, I always walk away, A DEAL IS A DEAL