The thread is about Sky and someone said 'tell them you want to cancel' and you said it doesn't work. Yes it does. Giving examples about how it doesn't work with other things isn't relevant.
I cancelled a couple of weeks ago, and then got a decent offer to stay. So it works for a lot of people. If they hadn't have given a good enough offer, I would have left.
Er, you're talking about Virign Media TV, but this thread (and the post you quoted) is about Sky.