These arrows are rarely used by players with the required Ranged level, as they are expensive compared to other arrows and their only usefulness is for the dark bow's special ability, which allows them to deal two hits with triple rather then double damage. Even then, dark arrows are cheaper, stronger and have the same effect as dragon arrows.
The Grand Exchange information incorrectly states that these arrows can only be used with a dark bow, which was the case before the release of Elder Trees and their associated bows.
Many players thought that the arrowheads could be acquired by killing dragons, because of the examine option. Furthermore, these and dragon darts are not red in colour and are not precisely dragon items.