I have a request to everyone here that's also in their own interest. There's a professional grimmer
on Stars. He has grimmed almost 200K hands and is winning at 4ptbb/100 and made $60K doing this on ptr. Maybe he hasn't always been doing this, as the PTR session history doesn't go back that far, but given how consistent his results are and how consistently I've seen him do this, I suspect this is the case. He sits HU, only plays the button, or if other people sit down too he finishes the orbit but never posts a big blind.
Please send an email to firstname.lastname@example.org
with your concerns. If they get enough they can either warn him or ban him and maybe even return his profits that he hasn't cashed out yet to the players he won it from.
Template email you can send:
I'd like to report a player consistently exploiting the system in a matter that's unfair to other players. His username is Ullahau. He sits down at games that are just starting so that he can play without posting a BB, and leaves as soon as the BB reaches him. This should be very easy to verify for you by just looking at how long he stays at a table on average and/or looking at his hand histories.
Every time I've seen this player, he has been doing exactly this. It's ongoing, so there can't be excuses like him just starting a session but then realizing he's forgetting an appointment or something.
Some people I know that play the same games as me have the exact same observations about this player. We'd all like to see something done about it.
Edit: You can go back further in PTR history with a premium account. I've looked at some sessions he played summer 2009 and it's exactly the same thing. So in all likelyhood he has been doing this for years and his entire volume is from cheating.