You're way misinformed. Healthcare pays out decent dividends if you're a provider. The problem is the initial investment in time and money to get a degree and license to practice in any of the 50 states.
You can estimate $200k of college debt and 12 years from BS to MD to residency where you may make $45-50k a year + free lunch from drug reps. By the time you finish up, you've got to work in the trenches to dig out of the debt because it's impossible to go to school and work a side job. After that, however, you can guarantee $165k minimum annual salary. If you specialize, that number can grow quite a bit depending on where you are and what you do. Your ROI is a long play, but if you land a job with good benefits, you'll retire wealthy.
That's under the assumption that shit doesn't hit the fan in the near future.
IMO, it will. Entire health industry is making WAY too much money. Each and every sector.
It's simply unsustainable and I think we are towards the end of that bubble.......