It reads to me that half the people in the thread are discussing poker site 'unethics' and the rest the participants. Gene amongst others is talking about particpants. Here are some numbers. This is exactly what goes on, Gene will back that up.

7 guys occupying 7 of 9 places at a table are all sitting in THE SAME ROOM with their computers (no need for conference call) On a $3/$6 table they can milk the other two seats for $200 each minimum in an hour. The guys play 6 games concurrently, not necessarily even on the same site. In an hour, on $3/$6 alone, they should take $2400 between 7 people.
IMO they are and would be plenty of people prepared to be bent for $350 an hour.

Do the maths on 7 people playing 6 concurrent $500 sit and go's. On average the other two 'visiting players' would be out in 10 minutes.