I'm sorry you feel that way. I certainly never suggested you quit. I believe in your product because you've presented evidence here that it works very well. But a good idea is only half the battle.
Business is hard. Starting one is a complex multi-step process, but there are several different ways to do it. Complaining about how hard it is, isn't one of them. But lots of people do manage to start them, and you already have a great product and the intelligence to write successful SBIR grants. That's a LOT more than the typical Joe starting a burrito truck or a drain-cleaning service.