Originally Posted by ViN86
This is why they have beta's Magus lol.
Sure they may sell 5 million copies, but that won't be the peak number of players at a given time, with server load balancing across the world, I'm sure they can handle it.
Not only that but I'm just guessing Blizzard probably owns a couple of servers...
For the beta test they likely used a small number to see what kinds of load their servers can handle, and what to do to optimize them. Now that they have the data they can copy/paste that setup to 10 or 20x the amount of capacity and scale as needed.