Moto - aren't you the one that complained about your Cheap M-C Friends?!?! Geez, no wonder you don't have any friends. If this is an example of how you plan to treat someone that is "a friend getting married", "a good guy" by screwing him, it's no wonder you have riding buddies that screw you!
Grow up. Get some ethics. Tell this guy what you think he can really sell his bike for. And if you don't...well, remember, it's true, what goes around comes around.