After many years in this hobby I don't see that leaving an amp on all the time provides any benefit vs. turning off if not listened to for extended periods. My solution is to turn on and off during the week if I listen in the evenings only and leave on during the weekend when I will spend more time listening. Also, I have never had an amp or other components go bad because of cycling off and on; I think the fear of premature wear, is highly overrated and unsubstantiated.
Will leaving an amp powered-up all the time...
lead to "cap saturation" that causes the amp to sound bright? A friend sez yes. A listening buddy of his left his Spectral mono's on for three months and heard a difference when they had a normal warm-up.