No, I am asking if for international purchases it is possible to make the transaction cheaper than any other methods (without the seller giving and discount)  if the process is:

1) buyer pays fiat money with his country's currency
2) the money from 1 is used to buy BTC
3) the BTC from 2 is used to buy seller's fiat currency
4) the money from 3 is payed to seller.

2+3 should be executed fast enough so there won't be any changes in  BTC rate.