How is it possible for dealers to offer you this feature? What if your account can withstand say 20 pips w/max leverage and the market jumps by 50? Will they really not hold you to that 50? If so, isn't there a way to take advantage of this by making a highly levered bet right before big news in the hope that the move will be larger than your account can withstand, hence artificially lowering your potential losses but not limiting your gains?