Every time I sit waiting for the servers to come back online (as I am now), or die because of lag, I wonder why you haven’t yet made the switch to cloud computing; more precisely,
Infrastructure-as-a-Service (IaaS). Have you considered it recently? It would let you outsource hardware maintenance so you can focus on game development, while drastically reducing downtime and lag. It would even let you combine all your server worlds into one, if that has appeal. I expect it would cost less than you currently spend on server maintenance, although I could be wrong. The only downside is you might have to lay off some IT folks.
Full disclosure: I have no personal stake in IaaS services. My only stake is as an avid DDO consumer/player.