That said, it really pisses me off that you were down voted like you were. There seems to be a rash of that on HN now. You were contributing to the conversation and backing up your argument with numbers. Right or wrong, that doesn't deserve a drive by dismissal.
The voting buttons mean "More or less of this content on HN", not "I agree or disagree". If you disagree, post a reply. You might teach the OP something, or might even learn that you're wrong, as I have plenty of times on HN.
Edit: I've turned this into an Ask HN thread here, since I think it would be helpful to have a discussion about this: