Don't most of the new components these days have a standby option? My Marantz unit uses 0.03w/hr in standby mode as does my CA streamer per the apps. I don't let my gear stay on all day and night. If it stays on overnight it's by accident. If it's on all day it's because I'm actively listening to music. My speakers get warmed up by playing music, vs just letting them sit there "warming up" with nothing being played.
If I found my gear was consuming $150+ of electricity a month just in idle mode, I'd be replacing them with equipment that had a standby mode or just turn the gear on a little while before listenings. But then again...I don't have such exotic gear to tend to.