It might have. It's difficult to know. I suspect that part of it is because KS features projects that are nearing completion. I had previously heard anecdotes that Kickstarter pledges come in quick at first, slow down, then pick up to the highest rate near the end. That seemed to be the case.
Our KS was 14 days, which is relatively short. I have the feeling that had our KS been a few days longer, or a couple of hundred dollars more or less, the result would have been pretty much the same.
The freakiest thing is that backers can adjust their pledges at any time. If you are just above your goal like we were, there is the outside chance that in the last few minutes a backer could pull out, and basically kill your project at the last moment.