It only takes one guy to play on that and steal millions. Yes not millions at a time, but pitch 20 ideas as different aliases and have 200k investments in each. Its not hard to appeal to desperation and mass fear.
The average Kickstarter is not pulling down anywhere near 200k, and it would take a remarkably clever con to pull off what you propose. Why would a clever con target Kickstarter, something that is trivially traceable? Also, why target a large group of smart, motivated individuals who know quite a bit about how to track people down on the internet?