Need an example of an artist turned businessperson?
One of the writing podcasts I listen to quite regularly is Writing Excuses.
On it are four authors, one of whom is a webcartoonist named Howard Tayler who tells quite a compelling story of an artist turned businessperson. He's been writing his Schlock Mercenary webcomic full time since June 2000, all with the dogged determination and motivation that any businessperson can muster. Very impressive.
Another example? Read the biography of your favorite author.