Other than the obvious, what are the benefits to leaving one's computer on all the time? Aren't you using more electricity that way? Doesn't the Mac have to run diagnostics on startup? This matter, as I recall, used to be debated.
OS X 10.11.6 iMac 21.5", Mid 2011 2.8 GHz Intel Core i7, 24 GB AMD Radeon HD 6770M Using Apple computers since 1980