These are still the cases covered by "few with potential to make real income."
Well, the good thing about music is that you don’t need to make money out of it in order to feel the benefits of engaging with it.
Even if you pay for 20 years of piano lessons for your child and he ends up becoming a doctor, I can guarantee you that being able to play the music you love - as opposed to only listening to other people playing it - will make you a happier adult!
So even if the investment doesn’t provide a financial return, it is still worth it.