A few people have tried to game the system and have been banned.
Well, I for one am pretty sure I have not "tried to game" anything. I do not have such habit (especially to gain just a few pennies). It's not even a money making matter for me, at least not yet as I've just thrown one of my lower traffic websites at BA to evaluate it as a monetization vehicle, to get some indication if it is time to shift some of my activities to bitcoin economy
etc. (and so far it is much worse than AdSense for example, though it is expected as your system is new, has few competing advertisers, lacks targeting etc.)
Besides, the ads still show up on my website (and the advertisers obviously get charged for them), pageviews, clicks and revenue continue to flow on the stats page etc. I.e. no indication that I have been "banned" whatsoever.
I'm hesitant to jump to conclusions, call anyone a scammer etc.
And if you consider me a scammer can I at least have a courtesy of being told so? Thank you.