They did not even have a working prototype just a bunch of guys with an idea they had on a napkin. Only fools invest in these things.
I think this is the really important part. You should be thinking as an investor, even if all you get out of the affair is a product.
Even big time investors lose their money in a business, but they reduce their risk by first making sure that the company already has an element of something tangible and they also do due diligence. It is probably harder to do due diligence on sites such as Kickstarter or Indiegogo, but you do what you can and then decide whether you can afford to write-off your investment if something goes wrong. Most business don't make it through the first year, even without the owner stealing the money, so take that to heart when you set down your cash.