personally I could quite easily prove my ability to read peoples I've never met personality to a 90% however 100% I cannot guarantee there is always something I miss slightly for whateverreason. the 100% is the catch not one person here can 100% of the time use anything they know. that's why the challenge is rigged. psychic ability is a skill and like all skills is susceptible to external and emotional influence.
take for example a star athlete or a singer whose been documented at a high achieving level. even they chocke at times. under normal pressure.
now tell this athlete or singer that if they do what they've done numerous Times before they win 1m but if they fail to do it to 100% even if they get 97% but not the 100% they'll be branded a loon a fraud and laughed at for yhe rest of their life by the entire world.
the test is unrealistic because no one could do any skill under that kind of pressure psychic or mundane. even if such a person had performed numerous Times in front of others. that degeee of pressure is crippling that's why it's rigged not because the test itself is unrealistic but because it's emotionally and psychologically impossible to perform 100%