Today employers reply to hand written notes because they stand out. When you have hundreds of emails and one hand written note, you will reply. Will you still reply to hundreds of hand written notes on your table?
I believe that the point is not in different strategies, but in different cost of living in other countries. Foreign colleges spend less on staff salaries, operations, etc. and that enables them to offer lower tuition. I am from Uzbekistan and tuition fee there is much lower than in US and would be more than affordable for Americans; however, it is still not really affordable for local people due to different living standards. I feel this can be the case for India as well