People need it for MSQ, as mentioned.
Story skippers are only going to have that one unlocked.
Alts are probably only going to have that one unlocked.
Anyone on a job under level 60 will only get that one.

What really needs to happen is the other alliance raids need MSQ requirements too.
Not only will that make the roulette a little more varied because more requirements to unlock, but we get the added bonus of those characters being able to come back during MSQ for some fun adventure or whatnot instead of solely being regulated to their side story and promptly forgotten.