A perfect or close to perfect market is one where all sellers can offer
their item(s) and bidders can offer to purchase while having access to
information about prior and current sales activity. On ebay there is a
wealth of information about what is being offered, what prices items
are selling at and what prices do not attract buyers. Are there scams
- sure, but they are a small small part of the action.

A perfect or close to perfect market is not one where you get your idea
of the lowest price. The only guaranty for the buyer is that if you
want a certain item you have to be willing to top the last bidders
price. The only guaranty for the seller is that your good will sell if
it is priced to attract buyers and buyers are looking. A perfect
market doesn't guarantee that some participants will make dumb
decisions. Think of the market as an opportunity that can be taken or
forgone - it's your choice.