Just in case someone has the appetite for more:
1) Why Bitcoin is Not a Ponzi Scheme: Point by Point by Lyn Alden
https://www.swanbitcoin.com/why-bitcoin-is-not-a-ponzi-scheme-point-by-point/
Discussion
2) Bitcoin is Not a Pyramid Scheme by Parker Lewis
Reminds me that should probably update the FAQ one of these days. If someone has any input, let me know.