its because rackspace is plain terrible. We had a VPS go down - and literally no one in their support team even going all the way up could explain why. Finally one of our own devs figured out that it was an issue with the VM. They talk a lot about their "fanatical" support - but thats essentialyl a whole lot of marketing hot air - support is average at best - and even on the managed levels where you pay 100 $ per month extra - there's no real managed service provided that is worth that much. I'd strongly suggest staying away!