hi guys

I would like to ask you for help. I have hard times to define how profesional playing is different when compared to amateur playing. I don't think in terms of money earned. I think about the skills. Is this that profesionals are more imaginative, have better ear for music or have better anatomy of their fingers and wrists for instance so that they can sound better? What is your opinion? Where is the line that separates profesionals from amateur players? Again, i don't think into account money cause I believe that there are many profesional level guitarists that don't make money on playing.