That however doesn't say anything about the total sales of the 4e PHB versus the PHBs of any other edition in total over all print runs, which is the meaty data that's conspicuously missing from all of this.
That's not meaty data at all. In fact, it's completely irrelevant.
1E lasted twelve years, 2E lasted eleven years, and 3E lasted eight years. 4E has so far been around for all of two years. (Seems longer, doesn't it?) So total sales is a worthless metric; 4E would look like an utter failure even if it was selling like gangbusters.
You could compare on a per-year basis, but that would just overstate 4E's success rather than understating it, since sales are not constant over the lifetime of an edition; most editions you'd expect to see the highest sales in the first year or so as the community changes over, followed by a decline and plateau, with smaller spikes at the release of "half-editions." (The exception would be 1E, since 1E was the edition in force during the craze of the '80s.)
I'm not saying the print run comparison is particularly good data, but it's on the right track. Compare sales in first year rather than print run size, and compare 4E to a whole edition rather than a half (the lauch of 3.5E is a much lower bar than the launch of 3E), and it'd be a pretty decent metric.
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