Firmly disagree here. In a lot of the campaigns i've backed (non licensed) there are things called "stretch goals."
So, if we meet our initial goal of 10K, we'll make this thing. But if we hit $15,000, we'll add this other thing, $20,000 and we add this feature, $25K and all orders get a free bonus, and so forth.
Besides, if I want to write a comic book, and sell it via kickstarter to help raise money to pay my artist, but only need 10K-- what happens when I hit 10K, I can't let anyone else buy a copy? What if I don't have the ability to distribute to stores? Plus, those extra copies cost MORE MONEY to produce!
No, the problem is not with over-funding, it's with licensed material used without permission.