dive-buddy - what Frankie Boyle has thus far failed to grasp - and has a vested financial interest in failing to grasp - is that laughter does not always equate with amusement.
The human response to shock and fear is often to laugh, but it has nothing to do with being amused, so when FB's audiences laugh, and hold their heads in their hands, it is not because they think what he just said was amusing - just that it was so offensive that their only reaction is to laugh as a release of tension.
People will pay to receive this stmulus, in the same way that people will ride roller-coasters and watch horror films, but to confuse the reaction with the happiness of genuine laugher is to entirely miss the point.
It finally dawned on Channel 4 that Frankie Boyle is not only deeply unfunny, his shock tactics have turned him from a witty edgy comedian into a deeply unpleasant human being - and their continuing distance from him is proof of that position.