What is the use of xp we get in challenges?

Question

I am wondering if the questions are rated and what if someone has huge xp from other courses

Answer 1

None, appart the fact to get a BIG score: that will not be prove of any skill, and just is near to a basic and dumb contest of who is able to piss the furthest... As in real life, appearances are too much important and often deceptives ^^