Kickstarter isn't a random third party. As the great-grandparent said, they're essentially assuming the role of the stock exchange - as the middleman and facilitator of the process. Thus they have an interest in seeing that the process is transparent and to some degree regulated.
I disagree. I see Kickstarter as just a middleman that facilitates the introduction between idea people seeking funding and a pooled collection of small angel investors. Like all middlemen, they take a percentage for making the the introduction if it works out, but after that they are not involved.
The issue that I have with this model is that most people throwing money at projects don't understand the amount of risk they are assuming and probably don't have the necessary background to even evaluate that risk. They just see a chance to get in early on some new game/gadget/service without realizing that their prize may never appear.