Actually I went to Uni just so I wouldn't have a job and so I'd have more free time to work on startups.
I only went to a few classes the entire time I was there, and I got a bad grade obviously, but it wasn't too bad considering I never went to class.
It was actually pretty good for me though. I learnt a lot about startups in uni thanks to all the support and help they can provide. Also, it's a decent environment to find other people working on startups which you can learn from and work with.
I will mention that I'm from the UK though, and back when I went to uni student loans weren't too bad. Thankfully, I should have them all paid off in a few years.