Two out of 1044. Eight people also decreased their pledges after we hit our goal, which took me aback for a moment—before it made me retroactively extra grateful that people had given beyond their comfort zone just to help me cross the finish line.
I would feel very awkward waiting until the last minute and certainly if they were on the edge of the goal, but in that campaign's case I canceled in the first two weeks and they made their stretch goal anyway.
I'm a hardware engineer so I'm just incredibly suspicious when really cool hardware pitches can't answer follow-up questions with sufficient details. Lesson learned: I'm an impulse buyer so I'm not allowed to pledge money on Kickstarter without waiting twenty-four hours and talking to a subject matter expert.