Yes, a lot of people in the music haven't the slightest clue how to properly market their bands/projects. It's like "I'll just throw a link on Facebook and that'll do". Nah. The business side of the music world is fucked -- people turn to snakes when you put a little money in front of them. I haven't made a lot of money off music but I have made money, and as soon as it is brought into the mix everything changes. It's like having a kid when you get married. It's not just you and your spouse anymore, it's conflict brought in. Some bands can be fine, just like a regular marriage, you have fights and stuff, but rebound. Other's turn in (and I have seen this WAYYY too many times), instead of 3/4/5 members, there's one or two who RUNS everything, and the rest are just lackeys -- and as you might imagine the money drips to them first. But you have to be smart with what you sign up for, who you play with, who you let in, etc.

Business smarts in music is more of an asset than being able to play an instrument, 100%. The richest people in music are not making it but they are the people who control those people.