There is no kind of warning you will give that will stop new gamblers from falling victim. Even the one in the reputation board is there and yet people still fall victim.
So you know that 1xbit is the service thread with one of the most views in the service board. They have 57k+ views and this forum is so strong in google ranking.
So, only their service thread alone that we are discussing on is giving them great exposure.
The exposure the thread gives them is it a positive or a negative influence? As already discussed if you should search for "1xbit.com reviews" here or on Google most of the results that pops up are scam accusation, and if a newbie should come to bitcointalk to read the ANN that you made mention of they'll be welcomed by scam accusation and warnings from forum members which in the case is very good.
You already mentioned that 1xbit involves in many types of promotions even outside the forum which I agree with you. Now those kinds of exposure has already given them name as one of the big players in the gambling industry. For this reason when some newbies join the forum they do not bother to read a out the accusations of scam. Rather they will go straight into the site and start playing. Only when they are scammed they will start voicing out.
The exposure from the forum is supposed to be negative but with what I explained, it can sometimes be positive.