I would disagree when you say that India is the only feasible market for franchise league.
I agree with you, India does have a big market but there are markets outside that continent too, the majority of the profit comes from broadcasting rights as the IPL make over $3 billion dollars while BBL earns a mere $100 million dollars and that is the case with Natwest T20 Blast as they current get around $100 million and it is a huge different but the ticket sales are good for BBL and i do not have the figures of other franchise leagues but they are conducting those tournament because of the profit they are making.
The BBL of Australia and the Vitality Blast of England is doing pretty well, without much help from India. But that said, India remains the largest market and it will be impossible for any of the other franchise T20 leagues to overtake the Indian Premier League (IPL) in terms of popularity or revenues. My advice to the other leagues is not to compare themselves with the IPL.
Competition is good to make things better but competing against a franchise where they earn a billion dollars for broadcasting rights alone is not the smartest thing to do
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Star India (of Rupert Murdoch) paid $2.55 billion for the IPL broadcasting rights, for the five year period of 2018-2022. On the other hand, the broadcasting rights for BBL and Natwest T20 Blast were not sold separately. They were clubbed along with matches of the national side as well as the other domestic tournaments. Sky Sports paid $1.56 billion for these rights in England for 2020-2024, while Channel 7 and Fox Cricket paid $920 million for the same in Australia (6 year period, from 2018-2014).
Now it is difficult to compare the figures, as the IPL rights were sold separately and the other leagues were sold as a part of the package.