When I got kicked out of Linewiz, there was NO communication, my passowrd just stopped working and there was my balance transfered to my neteller account (future play cancelled, but SBR got it re-instated).
The first reason I was given was I was winning to much and my balance had gotten too high (mostly nickle plays, ended up about 12). When I talked with them and noted 7.5 of those units were from 1 big ML dog, they calrified and said it wasn't so much that I won, but more my betting style. I always seemed to bet the "right side" (these were not steam plays, but value plays on my part). They didn't understand that a player had more than 1 out, and only bet the best number at 1 book. I didn't bet "bad lines" and often called them int point them out (no reward eitheer, but I knew that).
Another book I have played with for 2 years gave me a "compliment" this week. THey lowered my non full game (ML and ATS) plays to $100. I was allowed to call in or double pop on the net though. Then yesterday they requested no double popping and call in were also limited to 100 max. We had a very nice chat, no hard feelings, it was just business. Reason given was I had just been killing them (which I have, it has been a very good streak).
Maybe a book maker can chime in. I think its more the play style than the winning, imho.