It looks like the average software developer makes about 7400 USD a year in India [1]. Assuming a reasonable average is 60k in USA, that's about an 8x salary difference, meaning spending $2/day on food in India is something like $16/day in USA.

1: http://www.payscale.com/research/IN/Country=India/Salary, 328,379 rupees is approx = 7400 USD

It is useful because in our global world you can often live anywhere for certain jobs (at FeeFighters, our designer is in Bulgaria, for example)...

There are many opportunities to earn in USD while living abroad.