The price is based on demand. If, for example, India had a high demand for bitcoins, you will see a 10-15% higher price compared to the international price on other exchanges. This is absolutely normal, if you manage to register there and somehow sell your coins, then you could do it with a benefit for you.
Yups,i have read some thread that tackled about this strategy ,being registered in many exchangers local and international,then when they buy coins in one exchange and sell to another that has much value i just come to forget what they called this strategy