It seems there is a lot of confusion over currency to use with Betfair (Click here to open account and get £25 FREE)
Confusion is obvious as betfair doesn't support Indian Rupees while both NETELLER and skrill support Indian Rupees. If you have selected your currency as INR on NETELLER or skrill then during deposit/withdrawl exchange rate will be applied and you might lose or gain some money depending on current exchange rate.
To avoid exchange rate eating your money it is advisable to use same currency on eWallet and betfair. I recommend to use either USD or EUR everywehere. Just be consistent with same currency everywehere. If you are using eWallets purely for betting purpose then this will work best for you.