Maybe I'd contribute something. Maybe, but I wouldn't get my hopes up in any fashion. They've said before that the budget for a game like Psychonauts far exceeds the budget for an adventure game like the one they're making now. The Kickstarter would almost certainly end in failure without me being charged anything.
Tim Schafer has said that Psychonauts 2 would be like a $20 million game. Some things have raised impressive amounts on Kickstarter, but even if they were somehow to half their expected development costs, you'd still be seriously stretching that business model far beyond it's reasonable limits. Kickstarter seems to be great for funding smaller, indie projects. But it just doesn't scale up to AAA retail game territory. The gap between the Double Fine Adventure game and Psychonauts 2 is huge.
MattyFTM accurately identified the main problem. No matter how popular, I don't think we'll be seeing Psychonauts 2 reaching a viable Kickstarter goal that would let them produce it as a AAA game. At most they could use it as evidence to investors or a publisher that there is interest, but I doubt they'd risk a second Kickstarter project when the first has barely left the ground. Also, if people end up disappointed by the Double Fine Adventure project then they'll have no chance of getting funding that way in future.
Because of off the huge smash hit platinum selling games they've released? Just because you've heard of them doesn't mean they're wealthy.
I haven't played the first, but I think Double Fine is wealthy enough to make a sequel without the help of Kickstarter.
They could make a Psychonauts 2 off Kickstarter, as long as it wasn't anything like Psychonauts 1. It's not like the gameplay was the strong suit of Psychonauts anyway (or any other Schafer game for that matter), so that idea might not be as unworkable as it sounds.
I probably would, but there won't be a Psychonauts 2 Kickstarter, for the reasons MattyFTM already stated.
Also, didn't that Minecraft guy say he would give money to Double Fine to make a sequel? Though, I don't really see that happening, at least for a while.