Why do Indian Players Don't Play Other Country's Leagues Just Like IPL?

 BCCI's rules do not permit an Indian Player contracted or non-contracted, to  play any sort of franchise cricket - T20 leagues, T10 leagues or any competition of that format outside the country.

Their real intention is to safeguard the craze/importance of IPL and hence revenue generated from it. BCCI thinks if the Indian audience gets to see their cricketers play in other tournaments the interest in the IPL decrease.