Does anyone leave their amp and preamp on all the time?

I turn my integrated amp off, as I don't think it is good for the wear and tear on it to be on 24-7. I also don't think that it is good for my power bill either. It just seems like a wasted drain of power, cash and the longevity of the equipment. 

My PS Audio BHK Mono 300's and BHK Signature Pre have a stand-by mode that keeps them ready to go after turning them on. So it is a 45 second wait and they are off and running fine.

  Eddie,   S.S. i leave on all the time  It's the same as a light bulb.  You only see them go when you turn on a light.   Same with SS.  i know you have a very nice
 Power condishner.   Yes
 If not just blow as much money as you can on one
  You will want to buy me
Cocktails after doing it 
  The  power Condishner 
 Has to be over $1000  
   Just    Saying
 

I notice my Audio Research tubed line-level preamps (LS-15 and LS-16) keep the tubes glowing even when turned off; I believe this not only offers better sound sooner but also extends the life of the tubes. (I don't know about tubed amps, however.) I leave the big Levinson in stand-by in our main system. In our bedroom system I turn everything off when not in use. Ditto for our office system.

Love the Bedini amp!

I can't leave my Class A amps on all the time. They draw around 400 watts each just sitting there when not converting any of it to sound and they heat the room up noticeably by the end of a listening session.
They do not take long to sound good once turned on, though.

Similarly I do not leave my tube amp (main system) on as the tubes only have a certain life time and I intend to use it all with me in the room.

My main system preamp is also tube, but is always powered and just takes a minute or a bit better to wake the tubes up when switched to active mode. No big changes in sound once they are on.