Just wondering if there's a bit more to this than the idea vs. execution argument. Isn't a terrible idea well executed as bad as a great idea terribly executed?
What about skin in the game? If one's invested more capital, or has given up a job earlier to do things like research, talking to customers or building a prototype, his risk is higher and shouldn't he be rewarded for it?
Wouldn't expendability matter? What if the business guy can get a good development team to build the product (there are shops that work for equity) more easily than the technical guy hiring a capable sales agency (there are agencies that work on commission)?