There are numerous ways top make lots of money writing and recording. If you think of it, nearly everything you see (TV, Internet)or hear (Radio, internet, etc.) has some audio that was written and recorded by someone.
The mental "bridge" is, most of us initially, at least, want to write songs. At lease 1/2 of what I'm paid to record are scores that are written and recorded as I am watching a cut of the project that is 99% complete. This is not a process of writing songs, but creating songs, sound effects....lots of different things, all matched in real time to the image.Even the "song" part of the projects are not very satisfying from a"stand alone" standpoint. If it's part that runs under a voice over, the lines are smoother, quieter and less involved than what you would do for a piece of stand alone music.
Deadlines are horrific; often requiring a 30 hour stretch of last minute alterations.I have finished many projects less than an hour before they were played at a corporate annual meeting.
It's a tradeoff, but there's a lot of personal satisfaction in being able to work in this field.
Every time a meet a kid who is complaining that he's having trouble finding a $75.00 "Buffet" job, I try to get him/her to widen their perspective. Of course, it takes flexibility, calm nerves, the ability to play lot's of different kinds of music
and works better for non-entertainer" musicians.
Not lots of clapping and "attaboys" at 3:30AM.
For the rest of the day, just listen to all the sounds you hear. The possibilities are phenomenal. And, once you're established as a reliable, creative source, the money is GREAT and the work is plentiful.
Russ