Stupid question of the day: Should I leave Amp on?

I speak for all the experts when I say: "If it's not tubes or solid-state with class-A bias, leave it turned on".
Class-A solid-state uses too much electricity to leave powered up 24/7.
Now some experts say that it's O. K. to leave a tube preamp powered all the time. To me it's a waste of tubes.
Regards, Ken

I agree with Ken, I am scared that my power switches may not work- I only used them once when I got the amps! Though in a few months I will need to turn them off to swap out an interconnect and power cords- I better start preping myself for this :o)

My amp encourages me to leave it on, the power switch is on the back.

Here's a wrinkle - my amp is in "standby" until it's switched to full power. Is standby the same as full power?