For product design projects, kickstarter requires that you have a working prototype and a manufacturing plan. Most of the other project areas don't have that requirement.
I just launched a kickstarter ( http://www.kickstarter.com/projects/1402474606/the-ilex-edc-... ) and it was clear there was at least some human involvement in the approval process.
I haven't spent much time on Kickstarter, but my impression is that a lot of people are being handed money for ideas before they discover out how hard it is to turn those ideas into a tangible quality product.