1) The product has to be valuable enough to a reasonably large number of people
2) You have to be reasonably good at what you do (this isn't a given at all)
3) Very likely, you have to be reasonably good at marketing (and, if we're really serious about the "doing what you love" thing, love marketing)
Even if you really love doing something creative, without the above, you better love it more than eating if you're going to try doing it for a living.
1) The product has to be valuable enough to a reasonably large number of people
2) You have to be reasonably good at what you do (this isn't a given at all)
3) Very likely, you have to be reasonably good at marketing (and, if we're really serious about the "doing what you love" thing, love marketing)
Even if you really love doing something creative, without the above, you better love it more than eating if you're going to try doing it for a living.