I have dual degrees and am definitely in the camp of people that thinks you do not need a degree to succeed. What I do think helps as much as anything is that you gain a certain amount of discipline, increased knowledge of processes, and most of all, effective communication skills.
Even if just auditing a few classes at the local community college, I always recommend people take a couple of general business and communications classes (yes, the dreaded speech class). It gives you the experience to decide if college is for you, as well as a foundation for your future success. It's amazing the difference communication skills can make.
I know lawn & landscape marketing, branding, and web strategy. I'm not anonymous, I just don't self-promote.