It's just the miners getting paid their dues. I looks like you need to do a bit of reading on how the blockchain works but in the simply the each transaction is just BTC going from one address to another address, no fiat fun coupons involved. Anything fiat related is outside of that system. Even if you give a exchange 100 bucks to by BTC and send it to your address, the chain has nothing to do or knowledge of the fiat side of the sale.