Well you get what you pay for. You got to think most of the tractors he parts are 40+ years old. You can figure they probably arent much better than what you had.
Be thankful parts are available. If you dont like the parts you get from him ,dont buy any from him. I got 3 items from him today,no they not perfect, but useable.
He cant be doing too bad, he has over 33000 Ebay sales with a rating of 97 out of a 100. That dont sound too bad to me.