So, 1.5M for 1E, 1M for 2E, ~1M for 3E, far below 1M for 4E, and 3M and counting for 5E?
Those are some eye-opening figures. I had not realized the 1E boom was so gigantic relative to the editions that followed -- I thought surely 3E must have outsold it eventually. But 3E seems to have barely even nosed out 2E.
And for 5E to double the 1E figure... damn.
You know, the two editions that blew the roof off are the ones that were made without an eye on big money: The original version whipped up by Gygax and Arneson in their spare time, and the "left for dead" edition created by a skeleton crew, with minimal expectations, in the wake of 4E.