But they looked at me like I was a troglodyte and they dragged out the IMac manual and found some obscure line that said to turn off their computer when not in use. That became the gospel and to this day their computer goes on/off about 6-7 times every day.
The good news is that Apple power supply components are usually good quality (in the past anyway) and would take the abuse.
The bad news is that more and more components are now mfg'd in China and are really on the edge.
The systems I cared for professionally were only turned off when we had to get our fingers inside. Otherwise they ran 24/7.
Good grief.
That reminds me of Jay Leno's parents', leaving the remote on top of the TV and returning to their chair without it.