Too much CPU load, start some servers. Too little, kill some servers. Oops now CPU is too high, bring them back. No, it's too low...
It reminds me of the old UI bug where you get an off-by-one error for scrollbar logic and so it appears and disappears in a cycle until you resize.
Edit: I think we want something akin to a learning thermostat, but for servers. Figure out that I get a CPU spike at 5:20 on week days and spin some servers up at 5:10. Then spin em down at 8:00 when EST starts to go to bed.