I think it's a lot like many other things people do by themselves.
I will take music for example, im a guitarist that has been playing and composing for over 20 years now, never wanted to make it a professional occupation because i do not enjoy the lifestyle of a musician on the road, but it does not mean i do not take my music seriously.
I do record and put some of my stuff on myspace and such because i just want to share it freely.
I could not envision my life without making music.
Well i think my music and the one of most unknown artists is by far better or at least equally nice as most crappy commercial stuff we get to hear on the radio, still, most people will usually not recognize your talent unless you're a known artist playing on the radio.
That can apply to cooking, dancing, painting, singing, wood crafting and millions of other things, many people do not realize that popularity or celebrity is not a way to gauge talent or quality of a craft.