There is the spread between the bid and ask that you need to keep in mind, and it can be fairly large. Right now it's about 8% on LTC, meaning a 4% premium above the "spot" price for anyone who wants to buy and a 4% discount on sells. (That's typical for all Alts, but BTC is usually half that, so it's much smarter to buy BTC and then convert later.) That's where they make their money, just like the commercial currency exchanges we see at airports when we travel abroad. On the other hand, unlike others in the same crypto-fiat business, they charge no added fees.