Cat shows are a great medium for people to go and meet breeders, learn about different breeds - get to see them all first hand.
To make a sweeping statement about something you have never even experienced yourself is unfair to those that not only breed and show but have it purely as a hobby.
If you went to one you may well see cats having the time of their lives, playing with the judges enjoying fuss and attention from people - you might also see shy cats that actually are helped by the shows to gain confidence.
I have a girl - she came to me at 5 months old, frightened of her own shadow if I'm being honest - and would shake if you even went to touch her head. She is shown as an Alter (neutered) and is now a completely different cat. She loves to go to the shows - she spends her time in her pen (when she isn't fast asleep) purring, padding, head butting me and loving every minute of the attention she gets.
A friend of mine - who bought two boys from me as show cats recently told me a story of how they took their BSH cat out to a show - the Bengal boys both found and jumped in their carriers waiting to be taken and were most put out they didn't go, to the point they ignored her for the whole of the next day
Sure there are some cats that don't like it and don't suit it - and if they don't then they shouldn't be taken again as its not fair on them, but the majority love it - and we all know if a cat esp a Bengal doesn't like something they tell you
So please don't be too quick to judge.