Obviously it's a new thing, but I think it's the best analogy (that I could think of at the time...) and all I meant by it really is that I may pay more for a Kickstarter book than I might pay for that book normally, simply to see it be made because I want to help the creator somewhat. Perhaps a better analogy is donating to a Youtube creator or something, I don't know.
That said, just because you expect to get your money back on an investment, doesn't mean you are going to get it back. Hence the risk, but I think "hopefully maybe" is a little strong. 91% of Kickstarters are fulfilled completely, and amongst the failures the small investment ones (less than a few thousand) are the most likely to not be delivered on.