I've gotten the impression from somewhere the Bactrian two-humps are actually slower overall than dromedaries (which for that matter [I]were[I] put to use as archery platforms), but dunno if that has any real factual basis.

...I've gotta agree there's something rasther awe-inspiring about the image of a guy in those nomad tunics, toting bow and axe (and prominent moustache too most likely), atop the already quite visually jarring camel though.
Metal, dude.

Considerable amusement value aside, I can also see why they might not exactly turn up in EB too.