2 years of being a mentor and you couldnt gather 1.500 commendations? Sorry to be so blunt but that even if you put time and effort into this game, you might have put that into the wrong places if you wanted to be a mentor.
Being a mentor is not meant as reward, its meant as a sign of "Hey, this person has proven to be exceptional helpful and nice in the past and is willing to continue to do so" - and yes, commendations are given out for all number of reasons, but they're our best way of telling right now wether or not someone is acting in a way thats benefital to the community.