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

All tube pre-amps and amps in my main listening room and living room systems are never left on when I'm not in the room.  Tubes are too precious to burn up, the power draw is high on the amps but they run cool which is a good thing. 

However, both video systems use a Yamaha CR 620 receivers which are left on 24/7 and have lasted a decade without incident.  They draw less power and are also quite cool running.

My big 125 watt tube amps have a 45 second warm up.  Once on, they take about 20 minutes to reach maximum set bias.  Although they run cool enough to put your hand on the transformers (Class A/B), the tubes only last 2500 hours.  So, I do not want to run them full time or pay for the excess power used (I do have solar covering most of the year except the summer when a 9000KV system just isn't enough in inland SoCal).  I leave on my Bryston BIT20 isolation transformer all the time as it uses nominal power when no load is asking for power.  I used to leave my EAR 324 phono stage (solid state) on all the time as well but have switched to a tube phono stage.