I think that may be a little harsh, I don't think the point of the program is to embarrass people.
The point of most programs is to entertain people, other programs try to educate. If I don't find either of those qualities in a program I don't watch it.
I think they advertised for people to go on and like most things you get a broad spectrum of people applying. The photography students are pretty swithced on and there have been some very keen amateur photographers. The person that won the landscape episode, usually uses a phone to take pictures, but she loves her photography as much as the next person.