And not every hobby is as expensive as training to be a pilot.

Sorry, I didn't mean to imply it's cheap. I know it's not, and statistically is prohibitively expensive for ~half of America.

What I meant was if it's a priority, you can do it without huge lifestyle sacrifices provided you make a minimum of $40-45k/yr depending on your COL. Obviously if you have a mortgage and two kids and make $50k it's probably not the best idea. If you're a single 22 year old making $45k and you live in a cheap studio? You can do it without breaking the bank.