[onlyrealcuzzo]

If you're Netflix - it costs a non-trivial amount of money to send video compared to the server that runs it.

If you're Twitter, this is also true to a lesser extent.

Netflix & Twitter have more server expenses than just querying databases.

[ndriscoll]

Right, they have other expenses. I was commenting only on the "only 400k blades" part. That's a staggering amount of computing power. I'm sure their analytics and advertising stuff requires a lot of compute, but the core functionality from the user perspective should doable on something closer to 4 dozen.