Sometimes, with these kinds of negotiations, the buyer is getting a good deal, and leaving the seller at little room to breath ...
It can't always be about 'How low can I get him to sell it."
It should be sometimes how much is it worth to me, or are you going to get so much off that you have a not-so-good service relationship later, or warranty.
We often get caught up in our wallets and skip the practical side of a purchase. Nice to save dollars, but if you squeeze every single nickel, and spend your time with that in mind, you won't have much time left for camping, or fishing, or biking - or laying in the shade ...