Vivendi (owners of Blizzard) made a massive $1.5 billion in 2007, a great deal of it coming from the Burning Crusade.

We know for sure: it's actually around $1.2 billion (which is up 58% from 2006). Now, you can probably see that that's only $500 million short of the estimate that we were trying to prove was wrong, but don't forget that the $1.2 billion isn't just subscription fees-- it includes all those sales of Burning Crusade last year at full release price. What Blizzard earns from subscription fees is just part of that total.
 

The people in Eastern Europe aren't happy, apparently they don't think Vivendi was prepared with regards to distributing The Burning Crusade...

Most of you living in various parts of the civilized world probably have nothing to complain about. But some of us here in Eastern Europe are going through the same ordeal we did back when the original World of Warcraft came out. An ordeal basically caused by a huge demand for the game and pre-paid cards, and an appalling response from Vivendi. We thought they've learned their lesson by now, that there really is a demanding market around here... but, boy, were we wrong!