Hyper-V Survey: Why do you turn VMs off?

We have a survey up asking for information about why and when you need to turn virtual machines off with Hyper-V.
You can go and fill it out here: http://www.instant.ly/s/9qQwF/?s=ba
Please note, we will be taking feedback for a week (this will be shutting it down on end of day Tuesday next week).