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with all computers the bulk of the wear and tear comes from the electrical surge as it's turned on, as it takes a large electrical spike to start everything up, once up and running the power used is a damn sight less. The same is true for monitors, but the new LCD and TFT monitors use only about 1% of the old CRT's (that was where 90% of PC power usage used to be). The older hard drives wear out quicker with being powered up and powered down, ten times faster than being left running. Newer hard drives this isn't a problem and they also spin up and spin down as required, so when not actually being accessed they have no power usage.

also, many businesses leave their computers on at night to conduct remote maintenance tasks while it won't interfere with the working day.