I'm having more fun with the Warlords of Draenor beta then I've had with any of the non-WoW MMOs I've tried in the last few years
My WoW interest has lapsed to near nothing, but everything about WoD has me itching for it to come out and return.
I don't know how Blizzard does it. Their flagship game is 10 years old this November, runs strictly on a paid subscription basis (minus cosmetic optionals) when the strong-rising business model is F2P+Microtransaction, keep their graphics/hardware requirements low enough that 10-year old machines can still run the modern program, and they still outpace every single one of their competitors in total subscriptions revenue by a mile - using Wikipedia's Statistics table
as a guideline (guideline only, it cites WoW at 7.6mil, rather than the end-of-Q2 6.8mil reported), the only games exceeding its player base are Runescape and something I've never heard of called Dofus, both F2P.
Sure, Skinner's Box and all that. But it doesn't explain how they're able to build a better Skinner's Box than anyone else starting from so far behind technically.