Really there's only one definition of success:
Getting shit you want done.
If you read random artist biographies you're rarely gonna find the same emphasis on routines.
I don't consider the "modern successful media personalities" artists.
So, yeah, the stereotypical starving ones (or not so starving, some of them went millionaires in their lifetimes and still led a blurry / non "optimized" life).
Why not? What they make still qualifies as art.