Obviously.Blizzard didn't need to release an expansion.
They made a lot more money since they made an expansion instead of updating WoW.
Molten Core = t1
Blackwing Lair = t2
Naxxramas = t3
Expansion only:
"Short" instances = t4
Serpenshrine Cavern/The Eye =t5
Ruins of Karabor(Black Temple for those who dont know lore too well) = t6
They can make 5k a month from ads alone.Each Blizzard Server has a 50TB/s Connection. Those are like $5,000 a month.
They can make 5k a month from ads alone.
"Short" instances = Karazhan, Gruul's Lair, Magtheridon's Lair. 10-man, 25-man, 25-man. Karazhan is long, but is the easiest. It has many bosses. However, it is 10-man. Gruul's Lair is a 2-boss instance, and Magtheridon's Lair is a Onyxia-life dungeon, with 1 boss.
And you forgot Caverns of Time - The Battle of Mount Hyjal.