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Is that not the "Prostitute's Law of Diminishing Returns"?
I figure some people just like to complain about paying for anything. No doubt it often gets him discounts. Some people figure if you dont ask for a lower price, you're getting screwed.
Who knows, but as long as you got your money, I would consider it a decent experience. However, in the future I would give him a price and stick to it, whether it should be less or not. Of course that price might be a little higher than what other people might get just because you know he will give you a hard time if you go over your estimate (or under apparently).