Btw, there are very similar problems with the common practice of rating women's (men's too I guess) hotness/attractiveness/beauty on a 1-to-10 scale.
I recall an exchange on a board devoted to strip clubs years ago in which one guy advised against ever spending one's money on private dances with a stripper that wasn't a "9" or a "10". Some other guy replied that it would save him a lot of money to adopt this rule since he only expected to see a hand full of 9's anywhere (i.e., not just among dancers) in his whole life and maybe one 10 if he was lucky. Clearly the numbers meant VERY different things to the two guys.
-Ww