Bauserman, who considered herself to be a casual gamer, said she wouldn’t have wanted to work for a company like Blizzard, but even if she’d had the desire, it might not have been an option. Since the beginning, Blizzard’s ethos had been to hire only hardcore gamers, and its interview process reflected that, probing prospective developers on everything from their favorite Street Fighter character to which creatures inhabited the darkness in Zork. The goal was to ensure that all of Blizzard’s employees played video games,
So that's why their games played do well! Now imagine the Blizzard full of people why don't play games, even the ones they make.
