2. Kickstarter money is technically a donation, so you can spend the money right away if you need to. (taking a typical pre-order is little tricky from an accounting perspective if it's considered revenue)
Says who? Here's what the terms of use say:
It's certainly not portrayed as a pure donation (money given with no specific reciprocal commitment) in Kickstarter's terms.
As a project, I'd be unlikely to offer a complicated physical device that I was not yet able to produce. I might put weaselly bullshit about a reward being a great sticker and up to 1 device.
Edit: renamed 'Prepaid' to 'Unearned' -- had to brush up on my GAAP nomenclature
Edit: Other comments referencing marketing make a good point. PR value is big for a massively successful kickstarter.