Remember that HN users are opinion leaders, and the first ones to adopt new tech. Heck, they make the new tech.
My brother, my neighbour and my boss have never even heard the term webapp before, it's still in its very early phases. And these are the people that actually buy stuff. They have money and they spend it.
And here's the thing: Making a webapp is easy, making a company is hard. There's a long way from hacking an app together over the weekend to a sustainable company that will pay your bills. But if you're willing to put in the effort and time you can make a good living. You might even make a great business.