It is not a bad idea, but I don't think it is a good idea either. The reason many equipment manufacturers do not have power switches is to avoid the power surge with the "turn-on." I haven't had a pre-amp with a power switch for a long time. Many people who have good equipment leave it running all the time except during extended absence from home. I never turn anything off unless I'm going to be gone for a while (except my CD player while I'm listening to vinyl.
Happy listening!
Happy listening!