> Another guy, single, lived in a shared 2BR house with 8 other people for the same reason.
Its not so black and white, if that person is living in the US temporarily then his main motivation is to save a lot of money when in the US and then use that to buy a house back in India.
Some of them make enough money to live alone comfortably but why do that when your main objective is to save so you share with others who have the same mindset.