One of the biggest problems with these crowdfunding sites (at least KS) is that if you are too established, they turn you down because you don't actually need the $$. That may elicit a "duh, of course that's how they should do it!" response, but for anything other than a very simple project or something purely artistic, there is a lot of work required to get to where you have a prototype. That goes for design projects and even more so for technology projects. But by turning away companies who have done that groundwork and are "testing the waters" before committing $$ to production, they are actually making it a much more risky proposition for their users than if they embraced those project creators.
I know a lot of people are probably saying "bull, I see tons of such projects on KS!", but you are not seeing all the ones they turn down. And it is a lot. A real lot - more than I bet people think. So they wind up with a disproportionately higher # of lesser business-savvy creators who tend to blow it.