A Half Full Glass or Half Empty

"How we pay our bills tells us if we are optimists or pessimists."

Do you pay your bills grudgingly, looking for the mistake that proves someone is trying to take advantage of you?  Or, do you pay your bills grateful for the service?  Some say that is a good way to tell if you are really an optimist or a pessimist.  I confess that I vacillate between being grateful for the service and sometimes feeling I have been overcharged.  And that is probably just being human.