it really is no different to AMD asking for a 50% deposit on game orders to gauge interest and determine the size of the order to place, but at least we know that Stern and AMD will deliver.
but I agree sometimes annoying with kickstarters wanting all money up front and no guarantee of delivery. I have supported about 8 kickstarters / indiegogo's and 7 delivered 100% but Pro Pinball still have not delivered 20% of my pledge from 2 years ago and now have cut communication with all their pledgers. The technical ones like laser cutters, 3d printers etc from kickstarter and indiegogo have more issues of non delivery with many upset customers similar to a Jpop kind of situation and some taking legal action against those people.