And you know that based on a sample size of what? Also folks over here tend to buy slightly more expensive phones than ones sold in India/China. I am sure if you had to shell out around 50K INR every few months you would stop and ponder the consequences as well especially if you were only going to get about 20K for it. Don't give me BS that everyone in India replaces the phones regardless of cost because I send used phones to India all the time and people bargain like they are trying to buy vegetables from the street vendor
Also I have seen plenty of people using dumbphones around a lot of places in the world, there is a reason why the Lumia 520 sells so well and by that token a reason for Google to launch Android One and the Moto E and even the Micromax that you are using....much easier to digest 6 to 9K INR versus 50K.