"A technology project's odds of success are inversely proportional to the number of customizable settings in version 1 of that product." Great quote, and my gut feeling is that it is true - I'd really love to see some data here, even if it's just a few points (apps). Graph of nr of settings vs number of users for a few similar apps?
I would violate all kinds of NDAs to publish that data, but I certainly have it...