What wouldn't be an insulting offer?

If the later one is complete 100%, it's worth his price all day long. So tread lightly.

Yeah, that's what I'm worried about. He sounds like he has a stock pile just lying around, don't want to come in super low and insult him. I realize the $750 is a fantastic deal, but he's asking for OBO, so either he doesn't know which is unlikely, or he's just trying to empty it out and make a couple grand along the way.