Probably the most awesome Kickstarter I've ever backed. I'm so excited!!! Planetary Resources is a really cool company.
The biggest risk of Planetary Resources is that it turns out to be a scam, either accidentally or on purpose.[1]
I think PR could have amazing results for humanity even if the company itself doesn't work out well, so I don't want to sound too negative here.
[1] An accidental scam, in my words, would be something that would never ever work, but they didn't worry too much about it because they were spending someone else's money.
Not really.
Take away all the backers over $1000 (because I notice you complaining about that in another post), scale up the number of backers for every <$1000 level proportionally to reach $1M and it would only take 16,500 people.