Yes, because as Charlie Brooker proves, you are going to corpse at somepoint and there's no way you can record sequences that long without needing retakes. It's an entirely fake situation, in a TV studio. You quite often see Margaret or Nick almost biting their tongues to prevent themselves corpsing as well.

Sugar also frequently complains how the editing makes him look like he has no sense of humour and having spoken to people who have worked directly for him, yes he's hard but he has a very sharp sense of humour.

It's also a gameshow. He'll have a meeting with the producers beforehand so he's briefed on what happened and they'll agree an outcome. I often feel certain people are kept on to keep the later stages of the show interesting. Last night being a case in point. That frightful redhead sales woman should have been booted but she's been kept on in the hope of more fireworks later in the series.