And it doesn't help one bit, unless you aspire to be something higher within the organization. And, a business degree would be the only thing that would help with that.
By the time you're out of college, you'll change your mind on wanting to sell cars.
No degree needed to sell cars, but you probably won't go straight onto BMW sells. There are a few ways to enter into cars sales. As a used cars salesmen or at a multi-dealership are usually the norm.
Most dealerships sell high and low end cars. High end cars tend to get sold by older, more experienced sales types. Trade-Ins are sometimes sold on a second lot and that's where newbies usually start.
Sales are made by (upping) being the first person to make contact when a new client walks on the dealership grounds or answering incoming calls and convincing folks to come to the dealership. As a new person you'll normally be the one running out the building and towards customers.
There are businesses (like dealerstaff) out there that teach you the ins and outs of car sales. Afterward, they place you at a dealership. They get a cut of your sells for a little while then you are on your own. As you progress you also have to learn financing and a few other things (different systems).
Some dealerships have their own training program. They teach you about their brands, then, sales tactics. Your % structure may be different as a newbie, but once you have your foot in the door it's all up to you. You sell - you move up.
Try to find a business like dealerstaff in your area. If you can't find one, find a multi dealer with their own training program.