The thing with KSs, is that when they pay off, they sometimes really pay off. It's really thrilling when a KS you are backing goes through the roof. I mostly back for miniatures, and I've gotten some incredible deals over the years - Reaper KSs and D&L KSs were incredible value.
So when the system works as it should - the creator gets the capital they need to make a success, and the consumer gets a great deal in exchange for money up front and a bit of patience, it's a win-win. And I love feeling like I contributed, in some little way, to a small business becoming successful. That's a warm glow. So I'll keep backing them.
One other thing: I really enjoy delayed gratification. If I have faith that the KS will deliver, I don't mind waiting at all. Sometimes I'll check in and re-experience the excitement of the cool stuff I will eventually get. Then when it does arrive, it's like Christmas.
Occasionally, things happen and you get a dud. Such is life.