I think the last time this machine was turned off, was right when I took it out of the box when I purchased it.
Mine stay running until they crash or die, or receive some type of upgrade that would require the machine to restart or be powered off.

I used to turn my stuff off nightly, way back in the day. I don't know if its just better quality stuff these days or what, but I used to have a lot of hardware issues and whatnot when turning the machine off and on frequently. I think that if you let them run and run and run, it may actually be a benefit.