Keeping a PC running when you aren't doing anything with it sounds like a waste of electricity to me.
Electricity also wears down electronic components, so I think it also shortens the lifespan of your PC parts.
Electricity also wears down electronic components, so I think it also shortens the lifespan of your PC parts.
As for being wasteful, sure, but it adds up to an insignificant rounding error of my total energy use so it's not something I lose any sleep over.