I've never worked in car sales but a classmate from my undergrad sold at a new and used Lexus dealership for about a year and a half immediately after graduation. Even back in the 2007-2010 time period, there was so much information going around that the vast majority of his deals were "minis," or sales where he got the minimum commission of $150 (I've heard it as low as $75 depending on dealership and make).
Car sales is sort of like a startup where if you grind for a while and build up a base you can make a pretty good upper-middle lifestyle. $150-200k a year is uncommon but not unattainable if you're naturally charismatic and can put a lot of volume through your pipeline, especially if you can move into the high-end aspirational market (e.g. Porsche, Aston-Martin, etc). It's also totally possible (likely even) to do $125k one year and $30k the next, and a lot of people can't handle that high level of volatility.
I really enjoy cars from a design perspective and I really enjoy business, if I had any sales ability at all it'd probably be a good part-time job.