It's not permitted by Kickstarter. See the Guidelines ...
https://www.kickstarter.com/help/guidelines
Traditional US securities law has forbidden offering shares to non-"accredited" (read "unsophisticated") investors. That seems to be evolving into a gray area and crowd-funding entities other than Kickstarter are contemplating doing Internet stock offerings. See Title III of the JOBS Act last Fall. It's not settled.
-Sam
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