One Saturday, when I was not in the right frame of mind due to some personal issues, I had a sales person go crying to the dealer about my mistreatment. One of the reasons the dealer jumped me was that even though I worked alot of extra hours, many sales people work even more - and, I made twice as much money as that sales person. Made me think a little about where the salesperson was coming from.
Oh, and I still quit.
Good luck. I have always said, if you can sell service, selling cars should be easy.