[JangoSteve]

I have a hard time understanding why, for all the money Rap Genius pays Heroku, they don't simply set up their own instances on EC2 and run the app there themselves.

Who says they won't do that now?

Obviously when they started, they had no idea they'd have these problems or that they'd spend so much time diagnosing them, because Heroku told them that they wouldn't have these problems to begin with.