Not a huge fan of Stonemaier. In talking with the designer of wingspan, they were purposely keeping the game scarce to limit the designer profits and try to make a buzz around the game.
Purely out of curiosity, would you happen to have a (news/blog/article etc.) source for this? While not a strict devotee of them, I've always found Stonemaier games to be on the more respectable side of the industry, so this seems somewhat atypical of their approach.
I am guessing that it may be referring to this. Note that the post is on the Stonemaier site so it's their side of the story. Some searching also turned up a later analysis in a BGG thread.
In a hindsight given the extremely wide distribution, HUGE number of copies sold and many followup products all of this doesn't seem very relevant.