its because rear wheel drive cars need more energy to push the car. and in a rear wheel drive car, most of the enegry gets wasted more that what we loose in a front wheel drive, and that indirectly effects your mileage and in india, people are always behind mileage and stuff so we hardly find RWD cars. this question was actually answered this way in some automobile show. im not exactly sure in which channel
I would say it primarily revolves around higher production cost, as RWD would call in for safety devices which would increase the cost and not all indians are auto enthusiast and they want to just move from point A to B without much of an issue. So it would be wise for the manufacturers to invest in producing a car which could solve this purpose rather than thinking about a RWD which would increase the production cost.