I definitely agree that 50/50 is nowhere near a hard and fast rule. The split depends on how long the company has been around, how much progress has already been made, etc.

The larger point I was trying to get across is the discrepancy between the amount of value many businessy types ascribe to technical skills and the actual value (at least from my perspective).

If the only progress you've made on your company is the initial idea, I really do believe that the you'll up your chances of success significantly if the split is close to 50/50. The odds that you're even going to end up succeeding with the same idea is pretty low. At that stage, you really want to build a team of equals, not get employees.