No, playing more games at the time doesn't make your rating higher. But you may win more games faster, so it might be good if you're playing well now to do them.
If there is no difference then, would it be wise to stop playing as many games once you're at the top of the ladder? (since the less you play, the less opportunities you'll be knocked down)
Yea, I think it's the main reason top players play less games at once. They can focus more in one game, and have less at stake at any given time.
Or is there some hidden mechanic that over time will take ratings away from people who no longer play as much, which in turn forces them to continue playing as many games.
There's the expiring mecanism. After 5 months games expire, and count no longer to your rating. So if you had a lot of wins against good players a few months ago, and lately not so many, you might lose rating because of the expiration of games.
(Please some1 correct me if I'm wrong)
Edited 3/12/2016 05:08:11