When you sell a player, you only benefit by getting some money in exchange. You guys have made an other option and I'm well aware but it's really not that succesful because those players are expensive, even though they're not so bad of an alternative for scout players. But when bidding it's more about the bidder losing tokens then it is about the provider winning some( normal transfer procedure). So I think it would be a nice idea if the owner of the player gets the tokens that are injected by bidders when fighting over a player. This way the tokens don't just dissapear and you get money AND tokens, which is a really nice reward. It would also be easier than waiting 24h for the owner to reply.
About my last line: what about the owner setting a minimum amount of money and tokens for you to buy the player? This way you won't have to wait till he accepts/sees it so everybody wins!