I have some agreements and some disagreements with this thread. When I was a service advisor, I knew that the four (small dealership) Client Advisors in sales were all making $100k plus a year. And this was with selling 50 to 80 cars a month. Its completely possible.
When I transferred to sales I made $40k my first year, which isnt bad for that tiny dealership, especially since sales were down to 20 to 30 cars a month.