Well i don't know where you hang out, but almost no one I know turns their machines off.
I am a professional user and every night before I go to sleep I turn it off, unless I am rendering something overnight. I know many people who do the same.
Also, I think it's good to start the computer everyday to avoid many issues that arise when you have your machine on at all times. Just the way I see it.
But, I do know people who do never turn off their gear. I just think is a waste of energy IMHO.