Again, my numbers may be off... I just worked in the office and didn't pay much attention to the salesmen's commissions! Maybe it was .75%. I don't know. And also, I don't know about where the commision came from. What
tm37 says sounds more reasonable. And now that I think more about it, I'm pretty sure that it was tied in with the *profit* on each sale, not with just the sale price.
But I'd say $2k-$6k per month is not unreasonable. Although even the best salesman in the dealership I think only ended up with around $60k a year. Obviously you can't sell 30 cars a month every month. Maybe I was just there during a good time -- I know that the managers kept saying that we had a relatively low inventory the whole time I was there, meaning we were selling more cars than usual. Also the guys who sold the most cars every month tended to sell more used than new, so their average selling price wasn't as high, but their profits could be much higher. Man it makes me mad that I can't remember all of this stuff.
Anyway, don't pay any attention to me.

I'm going on incomplete memories from long ago. But again as
tm37 said, the hours are VERY long, like 10 hours a day 6 days a week (most of which is wasted sitting around and waiting and smoking, but that's still pretty bad) and I'd also agree that the typical earnings would be under 40K a year.