In my opinion the whole trade thing is completely ridicoulus or idiotic. When someone starts an "auction" on a pokemon, what actual point does that have? First off he wont sell it if he gets a bad price, which in my opinion is a total scam. There should be a auction system that makes so the one with the highest bid wins, even if the bid is bad so the seller just cant refuse to sell it.
Saying a minium is also idiotic, since the buyer just offers the minium 99.9% of the times.