My my.. there sure are a lot of opinions on this thread that don't seem to be based on much more than feelings.
If you have not both obtained a business degree and become a successful real estate investor (a qualification, in my view, which requires you to have made at least a couple of million bucks through REI) then you really can't opine on how much the first did or did not help you with the second.
Did I "NEED" my degree in order to be able to get into this business? I guess not. Do I find myself applying the concepts learned in the process of getting the degree to my business today? Yes. ALL the time. I find hit highly unlikely that teenage / early 20's me would have been sitting around reading books on accounting or statistical analysis if left to my own devices.
That said, no degree is going to GUARANTEE you success, but what it CAN do is tilt the odds just a bit more in your favor. If you keep making life decisions that tilt the odds a bit more in your favor, eventually you'll find that a lot of things just start going right. College grads make more money than non college grads, on average. A lot more. It's just a statistical fact. We can argue correlation / causation / etc, but the fact is that if you keep placing yourself into populations that have statistically high rates of success, your own odds of success go way way up.
Finishing a degree you're already halfway done with, for free, is a no brainer. At this point, the OP lacks not just experience, but credibility. Proving that he can stick something out until the end is important.. be it to a potential employer, or a potential business partner. Even to himself. Would you go into business with someone who's left everything they've ever tried to do halfway through? Would you loan someone with that track record money to start a new business?
On a related note, my life long best buddy just landed a job as controller at a publicly traded company.. a job that there is absolutely 0.00% chance he would have gotten without a degree.