[andr3y]

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You get 1000 people playing and there could well be a cheater or two in there and if a final table spot or two is reserved for cheaters here ... well ... it hurts your ev I'm sure.

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i really doubt that player who could see whole cards would bother at low limit MMTs. yeah sure will get a few buddies playing over the phone or whatever but it will only help them if they are on the same table which doesnt happen until late in the tournament in big MMTs.
As for SNGs i still dont think it meters that much in the end with this sort of cheating. And i wouldnt say that this is the problem in online poker only. Friends can come up with set of secret messages and strategies to communicate and exchange hand information in the real life game too.