I sold cars at a BMW dealer in the PA area for about 2 years and I didn't consider myself a good salesperson, but I still made $60+K both years selling.
That said, I hated selling cars. Mainly because I don't like dealing with people and no matter how good you are, I feel like there's always an uneasyness as to where your next sale is coming from and in turn your next paycheck. So I went back to school and am now am auditor.
If you like selling and are good at it, go for it. The top two guys at my dealer made between $130-150K, so there's definitely money to be made for those who enjoy it and are successful.