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
It's called arbitrage, if price on exchange A plus transaction cost and other various fees is lower than the price and fee on exchange B then you just buy on exchange A, send it to B and sell there.
Can be very tricky if you forget about the transaction, order, withdrawal and other various fees, also prices change all the time. It's possible there is a net profit of $50 for you if you buy and sell now but until it arrives on the other exchange the price may already be different.