I'm not a PC Gamer, and I don't consider PC gaming in the same realm as Console Gaming--but I will always give credit where credit is due--and give a shout out to a Milestone for Sales when one is reached.
Diablo III has set a PC Launch Record--despite early lacking sales.
Setting a 24 hour Launch Window record, of 3.5 Million copies sold, which gives the game the RECORD for fastest selling PC game of all time.
But lets not forget that those numbers don't include the 1.2 Million who got a FREE copy of Diablo III when they signed up for World of Warcraft Annual Pass.
As of now, over 6.3 Million have been sold.