+1. After four years as a messenger, you'll still be a messenger. Not much room to move up. After four years of college, you'll have a much wider range of options with a degree in hand. And if you still don't want to work, there's always grad school.
The messengers that can last for 4 years plus are doing it because they enjoy it.
I tried the office work, 9-5 bull**** and that wasn't for me, I wanted to be working outside doing something I enjoy.
I also do freelance design work on the side.
In essence, I'm getting payed to do two of the things I enjoy most. Having a degree wouldn't have gotten me any closer.