[joeysteele]

Why does anyone go on to BB,for likely several reasons,not just one.He indicated working on the Jimmy Saville case had been distressing for him, even as a Detective.
So BB was maybe a chance to get away from that and then go on for the experience, as a test to himself, the possible hope that it may lead to something else and also the possibility you might win and gain some security.
As well as meeting some new people.

He probably isn't that different to most that have gone on if they are all truthful about it..