Create enough value that you establish yourself as an expert in whatever your art is and then exploit secondary pursuits. I constantly refer back to Diddy getting famous with music, but also establishing himself as a partying/lifestyle expert and then making a killing on Ciroc. 50 cent did it with vitamin water and fitness, Athletes do it with endorsements.
It is the Tony Robbins model. His books didn't make him rich but they allowed him to charge 500k a speaking gig.
Your initial art is your marketing that develops your right to charge money for future art.