This would imply that the platform can create a community of people who are willing to donate over and over again to several relatively similar campaigns. Kickstarter does not work this way.
Kickstarter has been successful not because of their "community of investors/doners" but because they provide people who have an idea with a tool that they can use to reach out to their already existing followers and friends.
The doners of kickstarter campaigns come from the campaigns existing connections.. not from kickstarter itself.