Should I leave my imac turned on all of the time?

Should I leave my imac on all of the time....and if so why?..Thanks

The debate is as old as computers themselves.    The most important thing to remember, is lightning is a machine's worst enemy, and no surge protector can defend against all lightning strikes.  As the proverbial Clint Eastwood said:  "Do you feel lucky today?"
Look at your energy usage on your electric bill on a similar month weather wise with and without the computer on all the time.  
See if you can run with Energy Saver on without freezes, as many third party devices don't support Apple's low power mode.  
Once a month it is good to run in Screen Saver instead of Energy Saver as cleaning up happens on the system upon wakeup from sleep, or in the middle of the night if only Screen Saver or nothing is running but applications.   Energy Saver delays that cleanup.  You can get Macjanitor or Anacron to run that cleanup when you want.

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