In that case, I'd be very careful about validating the idea before jumping ship. Talk to potential users, non-techies, ... These are all the things I personally find difficult, but I recognize they're necessary once I'm outside my narrow area of expertise.
What it came down to for me was: If I don't try, it will gnaw at me forever, and I was reasonably certain of some value. Of course, there can be regrets either way. But I've only had the "itch that must be scratched" feeling about technical ideas, not business ideas. I think you are in a different situation since you are a techie with a business idea.