There's plenty of room in a startup for the programmer + business guy to be different people...I think for a company to go far they almost have to be different people. While learning something about programming may be educational to you, I doubt you're going to become the kind of cream-of-the-crop programmer you want building your technology.

If you're good at business, do what good business people do--design product, hire talent, scare up money, and bulid relationships.