I am still confused. What does it matter if they aren't able to join 100 tables or not able to join MY table? If a player is not likely to finish, they are just as likely to not finish 5 games as they are 1, or 20. Does it matter if the reason they can't join is because they are limited to X number of simultaneous games for having low karma, or they can't join simply because they have low karma?
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If they join 5 tables, they can only ruin 5 other people experience.
If they join 100 tables, they can ruin 100 other people experience.
Got it now?
It's not only MY problem, it's the whole playerbase problem.