Indian Idol – Why zero sum game?

I am hooked to Indian Idol this season as well but what causes a lot of uncomfort to me is the fact that Indian Idol ( and all other singing talent show in so many other languages)  is a zero sum game. There are many forces driving such a show – discovery for new talent, reality induced TRP leading to pricey ad inventory, mobile based revenue stream but none of these reasons I think are causal enough for it to be zero sum then why is it  hit driven ?

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