Let's do some math, shall we? Everybody likes math.
Game|Life reports that Rock Band has now totaled six million digital downloads.
You can buy individual songs for $1.99, or three-song packs at slight per-song discount, $5.49 (using the PlayStation Store numbers here, although I believe Microsoft Points price out about the same).
Assuming that every downloaded song was purchased as part of a pack (not a safe assumption at all), that's two million purchases at $5.49 per purchase.
2,000,000 x 5.49 = $10,980,000
Now factor in any number of single-song downloads for $1.99 and Rock Band has easily topped eleven million dollars in online revenue alone. That doesn't count revenue for the $170 bundle, or any of the recently-released peripherals.
This thing is a runaway train. And the new in-game store is only going to grease the tracks further.
