Everything to do with Tim Schafer being constitutionally incapable of reining himself in. And you know, that's fine when you've got a publisher holding the purse strings, and ultimately able to put their foot down when things get out of hand, especially when it results in titles like Psychonauts and the other amazing adventure stories he's helmed. It's a lot less okay when you can't go to the publisher and ask for another million bucks to see things through.
Actually, there is a problem with goals here-- specifically, that there wasn't one set in the first place. The Doublefine Kickstarter was an experiment that asked for money to finance the creation of a game, and a documentary film of the whole thing. Nobody knew what it was at first, certainly nobody expected it to get out of hand, and then Tim decided to make something Totally Amazingly New and proceeded to torpedo the budget.
What he has now is a fantastic idea, but it's the kind of fantastic idea that wants a whole lot more money than the KS brought in, because it's going to require a lot of artists working their hands down to the wrists.