I think it can range quite a lot.   most of the stuff I made, I couldn't give away.   but I think you'd find the secret sauce as it were - if you make it because you want to do it as a job, I suspect you'd find you'll never make anything too terribly noteworthy.  if you make it because you want/need to/have something to say/do it because it's part of you, you'll end up with some great stuff.  perhaps something that only you ever appreciate within your lifetime, but still great stuff.
so the tl;dr answer is yes, it's feasible.  but I think you'd make better stuff, possibly more, by making it for yourself than you would making stuff specifically to sell.