Yup, that's fair. And there are actually ways to scale WP beautifully with a small amount of servers (we're using less than 5 servers to handle our 10M visitors a month and content archive). Again, I keep meaning to blog about it, I just need to find the time.

Anyways, I'm all for articles like this that help optimize WP sites and get rid of the stigma that WP doesn't scale without cost. Thanks for writing it.