Well, about the only reason I don't have one, is that I get bored of beers very quickly, so won't even drink 2 pints of the same stuff before moving on to something else.
So 12 different brands/styles of beer/cider in the fridge is a better option for me...as there's no way I'm going to store 12 kegs and wait 12 hours to chill them when I fancy a pint of something that's not currently loaded!
I like my German (fizzy) weissen, as well as Belgian wheat & trappist beers, as well as lighter IPAs (I don't find extremely hoppy ones very refreshing), as well as proper ciders (especially single-varietal that taste of the apples they were made from), as well as a nice stout or brown ale...and most things in between.
My mood dictates what I drink. So there's a lot of gin & wine too!