I agree with Jason in that the problem is either the college grad or HS drop-out finding this extra cashflow to invest. I suggest robbing banks or selling sperm (that is because I like dangerous situations and touching myself) to raise extra cash. You could also get more than one job...or even a job, but that is no fun.
I think a more appropriate thing would be to go to college, take out every single loan you could get your hands on (especially the gov subsidized, b/c that generally has lower interest rates) and invest a vast majority of that loan money into stocks.
If you do your research upfront, the money you invest should yeild more return than the interest the loan itself accrues.
Plus, while you are in college, the loans don't accrue interest (generally). So, for the 6...I mean 4 years you are in college, all that invested loan money is EARNING money instead of costing you money. Sure you may have to live on steam and stolen ketchup packets from McD's...but being young is an adventure!!!
Those are my thoughts...but interest thought experiment, even though the underlying logic is weak. I agree with the philosophy that college isn't for everyone and is not needed to be successful. Success depends on the aptitude and drive of the individual.