Probably it is how the awards will be defined. Because kickstarter is not preorder.
Also the Kickstarter community so far has shown to be remarkably supporting. So I doubt that they will abuse the privileges that will be awarded. Also basic rule for the rewards should be that you are overpaying but you like it that way. The 1000 burgers for 1000 GBP is clearly unsustainable. But looking at the KS it seems more like a marketing stunt the high tiers. So it is probably budgeted.