I have played there a long time. I have a buddy who has been in there for over 2+ years also. Both of us have won and lost but won more, they hjave never ever limited us since we have been there. Unless you are btting $500 a play or so I wouldnt ever worry about that.
As far the uniqueness of the lines I dont feel they are as unique as they once were. They occasinally will shade number against a pubilc team. If I was running a book I would run it the exact same way. They only problem they may have is if you beat them on steam over and over and onver then they might have a problem with that but if you beat them on stuff that is widely availibile or they have shaded I can almost guarantee you that wont do anything to alter your bet size. good luck