I guess whilst you are still in the early stages of learning how to take good photographs it's important to shoot whenever possible as repetition leads to familiarity, but when you're heading out to take a specific photograph, in a specific light then of course it doesn't make sense to go out when the light is poor, in the same way that it doesn't make sense for an astronomy photographer to go out at noon. They will still probably get good photographs (maybe), but not of what they set out to capture...
I think the more experienced guys have also invested a lot in their equipment, so raising their camera's shutter count unnecessarily doesn't make sense.