If a player offers the market value or something close to it I usually sell the player (as long as the player doesn't get substantive playing time). Market value is nice, but most players on auction sell below the market value, so with this in-mind I'm not going to be horribly picky regarding bids placed on my player. I don't get tokens on auction sales either, so the tokens drop the market value at which i'm willing to sell my player at a little as well.