I don't think offering fair market value, or very close to it, is ever a bad thing.
As a person who has a few BINs listed I only hate one thing ...and this one thing happens every day. That is, when people think the lowest sales price ever listed on VCP for a card in a given grade is the "market value". I'm frankly sick of people says this. There are too many buyers than expect sellers to sell at the lowest VCP price when some of those sales are ridulously off-base from the norm. Just because one seller here and there happens to list a card at a ridiculously low price because they either don't know the market value, they don't have much invested into a card or they are selling a fake doesn't mean that is the market value of the card. You need to look at the normal final value of a card that has been auctioned-off, and you should also review the picture of the card to make sure it isn't on the low end of the scale for that grade (i.e. bad centering, bad registration, etc.)
But what you are proposing as "Best Offers" would be great, IMO. I wish more people were like that.
