There aren't many things I'd Go To The Shop And Pay Money For these days - even fewer that I'd pay money for having already read 50%. I'd say The Book Of Eliezer is probably one of those things though.

My two pennies: people don't go out and buy books on probability theory and Bayesian rationality for some light reading on the way to work. They want to get stuck in to something with some depth. If you're thinking of the past month's series as 'a chapter' (and "Rubes and Bleggs" would make a fine chapter), then you don't need many chapters for a substantial piece of writing. Have you read Hofstadter's prologue to the more recent editions of GEB? He started off trying to write a short piece about Godel. See where it takes you.