I used to negotiate much like he suggests -- AND LOST DEALS BECAUSE OF IT. I'm much smarter now. If you go back and forth more than a couple of times in email over a domain name, I can tell you from experience that your next reply will be "thanks, but we've found a better deal". People want things fast, and you're kidding yourself if you think people are going to spend 10 days playing some game with you. Decide on your price, reconsider if a lower offer comes in, and deal with it directly. Leave the used car sales tactics where they belong -- in a 1980's used car lot.