But of course if you're running a small kingdom like Crete with tributary princes, you better keep track of who has brought how much grain and oil and "ti-ro-pi-de" (tripods - the word that enabled Ventris to break the code).
Writing was invented to keep track of the taxes. (See Domesday Book for a more recent example.) Religious monuments and public proclamations came later.
I'd actually feel better if the earliest writing was soft-core porn than tax records :-)