I've made tons more money knowing how to mix and set up marginally complicated PA and video projection systems for a company that helps churches that meet in portable locations, than I have as a musician. Same with finding semi-old instruments that are listed as 'knob doesn't work, needs one string' type of electric guitars, doing a couple evenings of work on them, then selling them locally after they are setup properly, play nicely and sound plenty good enough.

I've made about the same tuning pianos.

Is that a career? Nope. But it is enough money to let me buy more instruments for my hobby as a musician! That's better than most people can say I guess. Latest is a Dean Boca 12 string electric guitar.

If I didn't have these alternative sources of income, I would probably not be having nearly as much fun making music that I like.

Again, not a career - but it is cheaper than paying a therapist!