people consider that mentoring is only good up to lvl 50, passed this level nobody needs a mentor because everybody is a pro, yes I am frustrated about all this, indeed

You are right, many people, including me, are like you. I dont feel I am good enough, understand ready, to go and mentor, but it takes some humility to reach this conclusion and most dont have it because most DONT care enough of an unknown to understand if themselves dont require a mentor in the first place. So how many of newby are going to be mentored by those that know less then them?

THAT is my worry