[jimbokun]

Excusing or not excusing are irrelevant.

If you stop using Heroku and manage your own infrastructure, you need to take all relevant costs into account.

Of course, finding an alternative provider of the same (or similar) services is also an option.

[jemfinch]

Isn't it commonly recognized that it's cheaper to run your own hardware than to pay a cloud provider? It just requires more capital outlay and maintenance.