We tend to leave one computer on all day, because we use it often (short spurts). Much better than turning it on/off ten times a day.
That one, we turn the monitor off though when not in use. & we do turn it off at night or if we know we won't use it for a long period of time.
We have experimented and it really doesn't make a difference on our electric bill. The point being it is not on all that much more than it would be on anyway. (Obviously if we only used it 5 minutes a day and it was left on all day, that would make a difference).
As far as reducing the life of the PC? Not exactly a concern of mine (not sure we have ever had to replace a computer because we wore it out, and believe me we keep computers forever. Talking decades).
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