Maybe, but they have to come up with the idea first. And then they have to avoid being discouraged from going through with the implementation. And then they need money to put the implementation somewhere on the net. And then they need to market it or hire a PR company to do that. And they need to maintain and support it. And then...you get the point. There's more than just the implementation to web apps.
Yes, and the idea is the only hard part of all that. Especially if you're already a webapp-guy, not a random joe-schmoe who doesn't know source code from a security code.
These are webapps, not operating systems, not mainframes, not databases. The barrier to entry, cost of operation, and development time are all pretty low. You can hire the PR people when you actually need them (probably sometime after you actually have cash flow). There's plenty of ways to market a webapp for free, and I sure would not hire a marketing firm to promote my new site.
