I would rather have them display a standard warning sign saying that Kickstarter can't guarantee the successful delivery of products, and there is no money back policy. I quite like the pre-order style Kickstarters (like the recent Project Eternity by Obsidian), and as long as people are aware that you effectively donating money I don't see the problem with it.
They do this. When you click to donate you get this (in the top right):
Kickstarter does not investigate a creator's ability to complete their project. The claims and responsibilities of this project are solely its creator's.
