Usefulness of a University Degree

I'm curious about what you guys would do in my situation, so let me lay it out for you. SEO and website creation is something that I've only gotten into recently (about 2 months), but I've never been more infatuated with anything in my entire life. This is what I want to be doing as a career. But I'm forced to dedicate most of my time to university. I'm paying around USD$30k per year for a bachelor's degree at a top 20 business school. Given that SEO is only something I've picked up recently and not making an awful lot from atm, university is not something I plan on leaving behind just yet. But I am left wondering about a few things. At what point (income-wise) would you say the possibility of leaving your course may be more beneficial than a university degree? Is there anyway for me to take advantage of the fact that I am in university to do/lea something SEO-related? What would you do if you came up with a big idea that has $xxxxx+ potential?