Those that I've known that use Horoscopes do it for fun, akin to
   fortune cookies, a wistful "what if" but don't take it entirely
   seriously. It's used as a categorization akin to personality
   tests without the tests and, I believe it's mostly harmless in
   the common use.

   Of course then there are nutters.

   I always had a fondness for biorhythm charts. They're not true
   but it's occasionally fun to look up one's biorhythm chart for a
   particular day.*

   Good for amusement value [because where else can you be told
   _something_ about your life based upon when you are born and
   what day it is] but woe to anyone using as a way to guide their
   life.

   Then again, some people believe economics pundits and use them
   as a guide to investing. Silly people.