I agree. If I look for Donkey Kong or Pacman now, I'd be lucky to find them in the $800 a piece range. I think the starting price was a good one. Not to mention if those are titles you are looking for, it'll be a while before you can get them again.
Sometimes getting a deal gets in the way of completing a transaction. I've done this to myself and lost out on some things trying to make the deal sweeter. How do you think you would have felt if he wanted $2,500 for all the machines and you offered him $2,000 and he accepted? Just curious.
Oh, and the offering of $1,500 probably would have went over better if you offered it at his house, after viewing the machines, with a vehicle big enough to haul them away.
Either way, sounds like the deal is gone. I would have passed on it because I don't have the time and not looking for any titles, but if I was still building/selling machines I would have grabbed that one pretty quick.