This has come up before, and I think the consensus is that it's an extremely crappy thing to do and that the sites should take action against players that do this kind of stuff!
I bring up again when I was in a tourney on UB and three guys started coaching/helping each other using chat. They weren't even friends, but they were all three from Australia
so they thought they'd team up against everyone at the table by announcing their hands or telling the others when they had a "monster," and all three of them were sitting in a row so it was fairly effective. I just sat and waited for premium hands to play until I got moved to another table, so it didn't really hurt me in the game so much as just kinda screw up the game for the whole table while I was there.
If you've got to cheat to win, maybe poker just isn't your game and you should take up something where cheating is part of the fabric of the game, like Major League Baseball