I have no reservations leaving mine powered on like this, especially those with LED lighting. Attract modes in modern games can be very dazzling, and I like to gawk too.
The games are designed to be powered on for extended periods on location, and many stay powered-up 24/7 for extended periods and survive much tougher treatment than they ever would in a home.
I’d actually expect that frequent power-cycling would be harder on the electronics than leaving them on, particularly the power supplies (due to inrush current).