I suggest you go back through your travel records of the last 6 or 12 months and see what you would have earned if using AA. Note that you cannot upgrade QF flights using AA miles, but in many cases it costs about the same number of AA miles for a full award flight in business class as it costs in QF points to upgrade from discount economy to business class. An award flight may not be an option for some people where employers pay for the flights, and award seats need to be available when you want to travel, so its not always a practical alternative.