What was your major? I would suggest that you use your college education to get a job that pays you good money so you can ski when ever you want. I do see some people that teach ski school and scuba diving classes as a second job that they do for fun. Granted they do it part time and at most it only pays for itself and not much more. I like to ski, but don't know much about the ski school programs. Though being an avid diver and having many friends that teach diving I see there are two types:
1) Most of the guys I know that are instructors do it as a fun activity that barely breaks even and they have a different much larger source of income: i.e. computer programmer, lawyer, manager, shop owner, etc.
2) The 40yo guy that lives with his folks on the off season and goes to nice places and lives in a car. He really enjoys it, but I have no idea how he will put money away.
The only reason I mentioned this is for the parallel between the two sports. If you really love it and want to do it, by all means go for it, though you really should think wisely about it.