The part you forget with this is the people cost. A company moving to an AWS (or other cloud provider solution) may be able to drop a human from their staff.

The part you forget with this is the people cost. A company moving to an AWS (or other cloud provider solution) may be able to drop a human from their staff. This is worth a lot more than saving a few dollars rolling your own ES. Also when you roll your own you usually maintain, if not increase staff count. Cloud providers afford businesses the ability to look at decreasing staffing while increasing capacity.