prosfilaes
Adventurer
B/c it's all anecdotal and it's all data collected from opt in options.
Those are contradictory. In any case, so what? Social scientists don't throw up their hands at answering a question even if they know they'll have to use opt-in interviews and their subjects may have reason to lie. At that point you accumulate information, and try and figure out what you know and what you don't know, and try and suss out inconsistencies and biases.
And part of the dynamic here is that Pathfinder fans tend to find the data and 4e fans tend to dismiss it, because in the absence of evidence, people assume (implicitly or sometimes explicitly) that D&D is the best selling game.