I think most of the grown-ups on this board know doing original music usually won't make them money. But, they enjoy doing it. It's pretty obvious that they aren't in it for the money. If they were, there would be other avenues they can take to do so. But they don't, because they don't care about the money. I don't get why it's hard to understand, since there are thousands of activities in the world that exist as both a hobby and profession.
Some folks have professions that make them enough money to pay the bills, but between family and work there's only so much time left. If they had to choose between something they love for no money or something they are tepid about for little money, I can understand why they would pursue the thing they love since they don't need the income from it. Of course, who wouldn't like to get rich doing what they love? But, there's lots of people who do what they love without getting rich from it and living happy lives.
The problem is that due to our nature to seek self validation, and at times seeking it through invalidating others, we create a false dichotomy. As a cover band musician, I'm not competing with original bands other than for musicians. I'm not in the market of doing a 45 minute set with 1-9 other bands on the bill for a share of the door. I'm not in the business of recording and promoting the recording. I don't play in venues that feature original music. On the flip-side, these original bands don't typically play weddings and corporates. They aren't typically doing 4 hour gigs at places that feature cover bands. They usually aren't working with agencies that deal only with cover bands. Crowds who want to hear the next big thing aren't listening to cover bands, and those who want to hear another version of "Don't Stop Believing" aren't going to shows featuring original music. Cover bands and original bands can exist side by side without competing against each other in the real world, and I don't see why they need to in the virtual world.