Really? I don't know if you've ever set up a VPS or dedicated server, but you should compare the cost of that to what Heroku charges for the same resources. You'll see a significant difference.

Let me put it this way. 1 Heroku Worker (roughly 80-100mb of ram) $36 a month. Now, what can you get for $36 a month? Go look at 6sync.com linode.com webbynode.com prgmr.com. You can easily fit 10 workers in any of them. With this I come to the conclusion you're paying 10 times more than with a quality VPS provider. Sure, you don't have to monitor these processes, and it scales up and down easily, but 10 times more expensive is reasonable? Please. :)

Let me tell you what I find reasonable: If you're charging me 10 times more for the same thing, I find it reasonable I shut down my resources when I don't need them so I only pay for what I actually use. Why else would you offer the ability to set the worker quantity via their API?

Or how about this: You park your car, you pay for a parking ticket that lasts until the next month. Reasonable? I think not.

You should also consider the fact that this could also potentially encourage more people to actually host on Heroku, rather than be scared off by ridiculous pricing at early stages. I'm also not trying to "disrupt" their business. If this would greatly affect their business then I'll be damned, and I think I'm not the only one. So don't count on it.