Not trying to poop on you, but I've seen you and hundreds of others conflate registered users with units sold. D2 did not sell 14-15M units. Registered users consist of tons of siblings, roommates, romantic partners and spouses on the same unit sold. They have always made public registered user numbers rather than units sold because it will be higher by a significant margin, and they know most people will make said conflation. Of course, you're correct that even 2 or 3M is better than 1M.