[Dylan16807]

> all of these available within the same VPC (talking to each other without paying bandwidth costs).

That's one of the real key issues, I think.

If bandwidth is 10x cheaper, then maybe you decide it's fine if only half your inter-server bandwidth is free.

[busterarm]

It's always worth measuring/understanding your application because likely it's not "half" but skews heavily one way or the other (in vs out).