How much for a restored Tuff Wheel?

I am thinking about my Tuff Wheel resto. The guy wants $540 to restore my Tuff Wheel. I paid $125 for it + shipping. He says he has restored Tuff Wheels for sale OUTRIGHT for $400-$600. Why can't I buy a restored wheel from him and sell my old wheel. I think I am getting over charged on this deal. What do you think? :shock: