I just now realized the wisdom and purpose of this type of canalphone. Perfect aiming. Being so deep into the ear canal points the nozzle linearly into the ear.
EDIT - Not only that but they would be more stable and less prone to movement. The best way to get a quality sound from a set of floor standing audiophile speakers is to put spikes on the bottom and plant them secure to a very solid floor, preferably concrete. The quality of sound will be dramatic, I know, I've done it with my Snells.
Doing this with a canalphone will bypass the wobble at the outer end of the phone, increasing sound quality.
What would really be great is to put a sleeve at the back end of the phones, as well. Talk about sound isolation!