Only if you wanna waste time. If you got what people want, and you can create anything original that people will wanna buy, then the thing you need to go to college for should be centered around figuring out how to handle your own business. A degree is just gonna collect dust in a frame on your wall. While it may prove useful to have one, you really don't need it.
No, but it makes you lose jobs opportunities. You can't do concept art or designs for games or movies, which will hurt your chances of a steady income. If you don't go to collage you will ha r to sell your art on your own which could give you an unsteady income. Hope this helps:)
No, but it does help if you study business and marketing to help you be a more successful artist. As for being an artist itself, a college education in artistic design helps you understand the mistakes in a controlled setting.
You don't have to but it would be a good choice. Think about if for some reason you can't be an artist anymore or your art doesn't sell you need a plan b and college graduates make more money than high school graduates.
Not at all. If you're a great artist, then you're a great artist. Of course, people would like to see some experience or the things you've drawn. It's just like writing a book. You don't need to go to college to write a book.
Of course not. You do need creativity and inspiration and you can't buy either of those. If you want to learn more about art for your personal enrichment the web has many documentaries and sites where you can learn.