It's an optional service for whales that will allow them to get 'rewarded' for.... being a whale, while Hitbtc makes its markets more liquid due to these contracts, which will attract more traders this way, and thus more potential fee income. Hitbtc makes it seem like they offer whales a great platform and deal, while in reality Hitbtc is the only party actually getting the most out of these contracts -- too many restrictions for a whale. On top of that, no serious trader will ever trust them with a reasonable amount of coins. It's nothing more than a desperate attempt to make themselves look professional....