you could just aswell say you ve been beaten by 90%, cause you didnt get a better score than them. If equalling means beating someone, you been beaten by a lot of people.
i guess it would be bad for the egos when getting a quiz 100% and then hearing you only beat 10% or something. I can envision the chaos and the tantrums now. So eventhough it is wrong, one has beaten others when they score exactly the same. I can see quizmasters reasoning now. You got to keep them content