someone who wish to challenge me, still would be able to do it
more close I am to №1 ,more likely it would happen, so it would happen anyway sooner or later
If I already challenged someone, therefore I already have 1 game.
There is chance that no one else would challenge me for a while, so I can relax, get some rest.
But, if Both: automatic system AND active users would challenge me, I never would have time to rest. Everyone would have too many games. №2000 would get tired like if they are №10