I've wondered how many people were dissuaded from LW because they pick up things quickly, value their time, and were getting a frustratingly low insight/minute ratio from the Sequences.

For some people (myself included if I'm honest), a low insight/minute ratio might be a reason for liking the sequences. They enjoy seeing smart folks agree with and reiterate their beliefs. It makes the reader think "ah yes, this person is right, he is smart, just like me".