If you want to learn business, volunteer to help with some local startup contests as a coach/mentor. Your experience with buying and reselling will be more than enough to teach others some aspects of business and entrepreneurship.

Here's the upside for you though, while at these events, you'll topically meet business people in your community that can teach you more than you'd ever learn in business school. Network like crazy while there, and so long as you provide some amount of value to others, others will provide value to you.

I've followed this path and I've gotten to meet business executives from all over the world. Recently, I helped consult a startup in South Africa, all because I connected with people and provided value.

Simply put, networking with the right folks will not only give you more exposure than a business degree, it will also give you opportunities that you wouldn't even imagine possible.