That's true, but it also works in the other direction: you get slashdotted, which kills your 2 running dynos. If you're away from your computer, your traffic is long gone by the time you get back, and Heroku missed some revenue because you didn't scale up.
Anyway, Heroku's business model isn't about making money on their oblivious users, I would rather bet on their add-on store's which now has a very minimal marginal cost to expand.
Anyway, Heroku's business model isn't about making money on their oblivious users, I would rather bet on their add-on store's which now has a very minimal marginal cost to expand.