P.S. I think you guys confuse being rich and earning a lot. Doctors, especially specialists, do earn a lot, much more than average salary. But are they rich? Have mansion? Yachts?
If your definition of wealth is having millions of dollars in your bank account, owning yacht, private helicopter or mansion...Yes, you are right that going to medical school and becoming a doctor will not make us rich. But we have to admit that doctors who work in hospitals or have their own clinics earn quite a bit of money and have a better life than many of us here.
I don't know the difference between countries but like in my country. If the average salary is $300-500$/person/month, those who have a medical degree and are doctors. They will have stable jobs and their income can be 3 times or 5 times, or those who have their own clinics can easily earn 10,000 or 20,000 dollars per month. They may not have millions of dollars but they have a lot of money and a huge fortune compared to many others.
The topic is about which college program that can make someone rich, not a program that will teach you a profession that will allow you to earn x3-x5 average salary in your country. My definition of a rich person - a person who can allow himself not to work, and not to look at price when spending money. I cant name any college program that will make a gradue have life like that. Imo it does not matter what you study in college, as you need to have several sources of income, businesses, possible several degrees and 25 hours a day to dedicate to work. And only after years of such routine, you become rich.
The example you have given, a doctor with several clinics who earn $10-20k per month. I dont think that such person works as a doctor and study previously a lot (studied before mostly to understand working processes). Such person who own several clinics is a businessman at first, a manager, than a doctor. I cant imagine how come someone run a business of a several clinics, and still work in one of them as a doctor.
I advice first to try to organize business, then enlarge it and parallel start opening new office/business, and while being busy, try to work parallel as a doctor. Its either healing patients, or running a business. I dont think its possible to do both perfectly.
It doesnt need to be perfect, what you do need is on how you would be able to manage and this is something which is that important. If we do speak about college programs or courses then there are those who could make you rich but still you would be needing up to work up that hard still. Just like on what you do said that the only time I do consider to be rich or wealthy is on the time that you do make out some passive incomes came from multiple source on which that it comes into the point that you wont be needing up to work for you to be able to make money and since you can be able to sustain then this is what we do consider out to be rich. It is just that do need up some extra step for you in order to achieve up this kind of state but if we do speak about only on relying with our day job on any profession on which it wont be giving out any guarantees that it could give out that kind of assurance that you would be that included into those kind of status type.
There are those courses that pays up that well but expect that tuition fees are bit high in comparing into other but still in overall you would be ending up on being a worker doing out that 8-5 job. Basing up into the example that you've been given on here about being a doctor then i can say that its one of the courses that could potentially that separates you in other courses as well in basing up on the potential income or money plus with that salary then you can say that you do have the advantage.