In case the author is reading this thread - might be worth adding a couple more reward tiers, for example an equivalent of the "major sponsor" on an individual level, maybe $30-60 to be named somewhere as a supporter. $15-$200 seems like a very big gap (and of course you can chose to donate in between, but I presume that reward tiers are effective in pushing people to donate more).

Looking forward to reading chapter one when I have time, though I suspect it will confuse me quite a lot...

edit: I see he is, already commented before I wrote this