I'd much rather be 19 with a few million in my pocket and not having to worry about showing up to class. Invest it right, you'll never have to work a day in your life, even if you never make it to the bigs. If you're a pitcher, it's much better to have that Tommy John surgery on a major league team's dime instead of having it done in college and missing time that could be spent increasing your draft status.
If you're getting offered good money coming out of HS, there's not a good reason to go to college.