let's be fair. we shouldn't assume a member is trying to take advantage if they ask full retail price for an item. they may not have thought to research for current prices through the big sites.
we should gather all the facts related to each situation before deciding what to think or do.
for example, if the seller makes a habit of selling off inventory at our site, then i would think they'd be experienced enough to check current market value. if the seller just decided to empty some shelves, she may not have thought it through from a professional perspective.
i check a seller's posting history before i decide to buy. if they appear to be running a resale operation here, then i hold them to the same standard i would any other business. if they're obviously an amateur, i "cut them a break".
if it's a good price from a real member ... etc, etc, etc