I agree with diemen. I'm also a musician, and if you're gonna be professional in one aspect of the idiom or another, (whether it's being in a band like u2 writing original music, or being a music teacher, or being a studio musician playing other people's tunes, or playing the chicken dance at the holiday inn with a wedding band for that matter,) you've got to tske it seriously, because who else is going to?
for example, there are people on this planet working as bankers, secretaries, insurance agents, stock brokers, and a thousand other professions, whose job consists of sitting at a desk using numbers all day long. to me, it's mindless boring crap and I would never imagine myself doing it. but the world NEEDS people to do these things, so hopefully people who do it take it seriously AND get some sort of personal satisfaction from the work itself as well, because a person like me does not take those things seriously, because I've got a completely different mindset.
so, whether it's "just music" or not, taking it seriously is super important. To me, anyway.
as far as the monetary problems of real life, well just because bono and sting have more money doesn't necessarily mean they don't have problems.....in fact, maybe they've got concers about that too.
example: an african bushman doesn't even KNOW what money is, right? he's got to hunt and kill his dinner, support his family, and try to survive as well. he's doing it WITHOUT money, and maybe he's truly happy, because it's the Only reality he knows.
you and I worry about paying the cable bill, buying groceries..etc., because it's a reality we're familiar with.
bono and sting worry about investment returns, where their capital gain are, what kind of profit tour a made compared to tour b, etc. because it's the reality that they know.