For what it's worth, as a decent sized collector, when I pledge on KS, I'm in it for the long haul, and I never cancel a pledge. Over 100 projects backed, and not a single cancelled pledge. I lost respect for backers who cancel their projects just because it looks like funding isn't going to happen. I see it as I'm supporting them, but they are giving up on me. Petty, maybe, but if a creator cancels a project, I refuse to back a relaunch and, more often than not, I don't support that creator again. Good or bad, that's the way that I am. Cancel, and you run the high risk of offending backers.