$150k debt is nothing if you go to a decent medical school.
As I alluded, it's not just the 150k in loans. It's 150k + 7 (or more) years of lost wages. The total economic costs are easily north of half a million dollars, assuming a low-paying 50k/year starting salary with no raises.
I would not say everyone in medicine could 'easily' make a comparable amount of money in another field. What attracts a lot of people to medicine is the formulaic nature of obtaining money and prestige.
Why not? What skills are required to be successful? How do you think medical students [or those that now pursue it] lack those skills? You're asserting a lot without any basis on this.
Also, your second statement is just way off base.
http://www.medscape.com/features/slideshow/compensation/2011/ - see slides 16, 17
If people loved the money and the prestige, they wouldn't respond saying "no i would not still choose medicine as a career." Many of the higher-paying specialties (cards, uro, gen surg, rads, plastics, anasthesiologists) responded saying they would not choose medicine again.
You take these courses, you volunteer at these places, you get into this school, and so on, and your future becomes assured, and if you want, very predictable.
There are roughly 18,000 spots at US allopathic (ie: MD, not DO) schools. Of these, many at public institutions are restricted to state residents only, thereby increasing the applicant pool at other schools. There were 43,000 applicants. It's not quite as easy as you suggest.
There is no other profession which is more 'safe' and 'guaranteed'; e.g. 99% of graduates ending up with very highly paid jobs. And that's got to attract a lot of people. Also, the skills required to make money in other professions is quite different.
I don't dispute this once students enter, but it's not the primary reason for the traditional (ie: recently out of college, hasn't worked apart from student jobs) students.
I would guess about 75% of people go into medicine primarily for money, prestige, and the guaranteed nature of the job. It's a way of making money without taking a risk.
Again: evidence?
It's the type of job that controlling/protective parents will push their children towards at a very young age.
This is irrelevant.