It's not one event.
The Broken Age problem has already been mentioned, and is what most people are familiar with, so no explanation needed there.
There was Spacebase of 9, which was funded via early access, with Schafer promising continual support over several years to continue to expand the game until it was complete. That is what was pitched to people to buy the game before it was even close to complete. Schafer even went so far as to say:
Development was later ended.What's worse, it was ended right after getting a bunch of people to buy it during a Steam Sale. So a ton of new sales were put into an 'in development' game, and then the plug was pulled. This was before the age of steam refunds.
Notch, creator of minecraft and person now with more money than God, approached Schafer offering to fund the creation of Psychonauts 2. Tim agreed, until money concerns forced Notch to pull out.
http://venturebeat.com/2013/02/04/exclusive-minecrafts-notch-no-longer-funding-psychonauts-2/
Of his crowd funding endeavors, only Massive Chalice wasn't a complete fuckup. So maybe third try's the charm. Though, that project was managed by Brad Muir, who left Doublefine right after to join Valve.
This history does not exist solely in crowd funding. Brutal Legend was severely behind schedule and massively over budget, which is why the last third of that game turns to total shit.
I love Doublefine, and I love Tim Schafer. I used to wonder why publishers wouldn't publish his games anymore, and now that they've turned to crowdsourcing so that this sort of stuff is now in the open, I realize why. He's a great creative mind that's terrible with management. If you want to give him money, hey, go for it, I wish it the best. But the odds aren't in your favor.