But does it actually offer that, or is it just a generic forum UX? Frankly, I think the latter market is pretty well covered by cheaper, full featured and easy to host (PHP) alternatives. There's no point in going after that.
I think what SO (and possibly Quora, I'm not there yet) has shown is that you can succeed and displace well-established competitors if your software is custom tailored to the domain at hand.
So, what differentiates your engine-for-the-entrepreneurial-community from any other engine? What specific features does it have just to solve that problem?