This is being enforced on some level, I received this email today in response to sitting out at 3 different tables (along with 4 other players). We were all booted from the tables as well.
This is encouraging:
PokerStars ring game rules (http://www.pokerstars.com/poker/room/policies/ring/
), article 10 & 11 states that unless you have the intention of playing, you should not sit down at a ring game table. We are sending you this e-mail because we recently were deemed to be in breach of the above mentioned rules. The infraction was specifically sitting out at a $200/$400 FLHE table. In the same period, you were observed playing at other tables.
As you may be aware, we have recently had many issues with players camping out at tables either waiting for presumed 'fish' or blocking other players from getting action. When we talk to players about this problem, we invariably find that everyone is blaming everybody else. They say that they have to block seats otherwise they will never have the chance to play against the weaker players.
Whatever the reason may be, this is against the rules and repeated offenses might lead to players losing their playing privileges for a period of time. Now, we don't want to ban anyone, so we are trying to find an alternative solution to the problem. We are two ring game managers here at Poker Room Management (Nick & Baard) and you can add us on Skype . Just include your screen name in the add request, and you will have a chance to be in direct contact with us. So from now on, if you see a table where players are camping out, send us an IM on Skype instead of sitting down and being a part of the problem.
By doing this we are hoping to clear the high stakes games of this problem which, quite frankly, creates a lot of bad blood between players and is very detrimental to the friendly atmosphere we strive to have in our games.
If you have any comments or questions, feel free to reply to this e-mail address, and we look forward to seeing you playing at our tables in the near future.