“DNSSEC Mastery” business numbers

When SSH Mastery came out, I published the initial sales figures and a followup a month later. The results of publishing one book is not really data, however. It’s one data point.

A second data point is also not data. But it’s twice as close to data as one data point.

Let’s compare and contrast SSH Mastery with the book I just published a couple months ago, DNSSEC Mastery.

DNSSEC Mastery was pre-released via LeanPub, so that my hard-core fans could get copies of the incomplete draft. This was al...