You may not believe in Karma, but you must understand that you're spoiling someone else's matches and time they took to enjoy the game on their spare time? And you still don't care about that? Once you realise that you're doing very wrong, your concious won't let you get away with it. Eventually you're gonna feel bad, whether you believe in good or not. And by feeling sorry, you'll magnet the same misfortune happening to you. I don't wish you that, hence why I warn you. Quit it, let them play and enjoy their steady progression. You could start playing more seriously and committed instead, and advance in ranks like a true champ. That would be so much more satisfying and no bitter aftertaste.