TV Guide TV ratings are rubbish!

I always knew that the "Top 10 TV" listed in the TV Guide each week (listing the Top 10 watched TV programmes of the week) was rubbish, especially of the bias towards TV One programmes, but now I am totally convinced! New Zealand's Got Talent is a show on Prime TV at the moment and I was sure it would be in the Top 10 this past week. I know heaps of people that watch this programme. But I had a look at page 60 of the TV Guide that came out a couple of days ago and New Zealand's Got Talent is no where to be seen in the Top 10! So yes, the TV ratings in the TV Guide are a load of rubbish (and I've never been surveyed my whole life!)