Best selling PC games list of all time (from wikipedia)
The Sims (16 million shipped) The Sims 2 (13 million) The Sims 2: Pets [expansion pack] (5.6 million) The Sims 2: Seasons [expansion pack] (1 million) World of Warcraft (11.5 million subscribers) World of Warcraft: The Burning Crusade [expansion pack] (3.5 million) World of Warcraft: Wrath of the Lich King [expansion pack] (4 million) StarCraft (11 million) Half-Life (9.3 million) Half-Life: Opposing Force [expansion pack] (1.1 million) Half-Life 2 (6.5 million) Guild Wars (6 million) Myst (6 million) Doom (5 million) Counter-Strike (4.2 million) Cossacks: European Wars (4 million)
Yay Half-Life is on the list! So is Doom! Surprised that the Sims is on the list though, more more that they are the highest sellers. I suppose it's because it's the most organized virtual-life type game out there.
That's quite a bunch. It's not surprising though that the Sims and Wow made it up there. However, their sales figures are huge.
I checked the wikipedia page (Link) for the best selling games of all times and noticed quite a peculiar thing. The PC games sold a lot less than console in numbers, now I agree you can attribute that to the fact that people prefer consoles over PC when it comes to gaming but I'm pretty sure you can't deny the hand of piracy here.
The good thing about WoW is, that Blizzard has enough money to make other hopefully great games.
I hope Diablo III is worth the wait. As far as I've seen it's a huge improvement over its predecessors but I wouldn't want Blizzard to mess up on this masterpiece.