Drawing illustrations and comics is my only source of income, so yes. And yeah, I did finish college (I was an illustration major).
Having a degree hasn’t helped me at all but the skills I picked up in college definitely have. As an illustrator/cartoonist, nobody really cares that I have a degree. But they do care that I can draw fun, interesting things. I wouldn’t be as good as I am at drawing fun and interesting things if I hadn’t spent four years in school, drawing every single day and getting critiques, advice, guidance from professors and peers.