Ears. The ultimate handicap.

I know this might sound a bit silly, but have you ever been listening to music and pushed the back of your ears forward just to see how the sound changes? The sound completely changes - i mean completely. Give it a try if you dont believe me. For me vocals highs sound thinner and more promounced. Sounds ridiculous I know. But it got me thinking, if a persons ears a stick out more, or is more cupped looking how is there experience of sound influenenced and thusly the gear they buy. That got me thinking about wouldn't it be an interesting comparison to see what rigs people have and a picture showing the form of their ear. Not sure there would be a correlation. But it would still be interesting.