Sony has just one big banner T Series which usually produces few big budget movies in an year and rest r mid to small budget movies, apart from this there r some dubbed movie studios + smaller bollywood movie banners which they have agreement with + few dubbed hollywood movies rights which they acquire hence obviously their content acquisition cost will be lot lower than Zee or Disney- Star which spend lot of money in acquiring new & old movies via agreement with big or small movie banners of library companies....Disney-Star infact invests a lot in also acquiring many hindi/regional dubbed hollywood movies.
If we draw larger comparison then too Sony has much smaller bouquet of channels across genres compared to Disney-Star or Zee and again barring maybe Hindi GEC its spending would be lot less or nil (channel missing in that genre like music or lifestyle) in all other genres . In sports genre too Disney-Star invests lot more than Sony