Who says that's the "art of working" though? Why not "make as much money as possible while enjoying what you do" or "enjoy what you work on while making as much money as possible" or just "make as much money as possible no matter what" or "just enjoy my work as much as possible no matter how much money I make"?

I think the "art of working" is deciding what kind of work you want to do, how big a part of your life you want it to be, and then doing that.