Ok imagine that the best player would stop playing, just because he is the best. Then obviously a new player would become the best, maybe just a little better than the others, but would be the best.
He would stop playing, so that yet another player would be the best. This keeps on going untill noone is playing anymore.
So I agree with bunny, it doesn't make sense. But since you are from Belgium, it makes sense that your logic doesn't make any sense at all.
To get back on the topic, a mod will not bring more activity to the community but might split the community. The only way to seriously increase activity is to promote the game and get new players to play it.