A Big Cat cannot be kept in a cage.
Why do people keep Big Cats in cages? Once I dismiss ignorance which is never an excuse, I am left with only one answer. Greed. People make money from a caged Big Cat.

The Exotic Pet Trade
The ‘exotic pet’ trade causes more suffering for big cats than all of the other atrocities caused by humans put together.
Who supports this cruelty? People just like you do
Those who make money from caged animals rely on people just like you.
They charge an entrance fee so that you can stare at these poor creatures in their misery, and then offer to take a Polaroid photo of you with a baby tiger or leopard for more money.
Sadly, people just like you will pay up.
Even sadder is the inescapable fact that these cute cubs grow. Suddenly they’re far too dangerous to be near people at all. So they are bred to produce more and more cubs for more and more photos for more and more money. And you know where they will end up – in cages!
I wish everybody would support Big Cat Rescue and help to Stop the Trade.