The reason I raised the Cabilis factions was for fun and roleplay. You don't run into too many half-elves in Neriak, Grobb, Oggok, or Cabilis. Other than that, the banking/selling is nice for convenience, especially for Evils as Darian noted. There's also a couple of quest lines like the Monk shackles or the Shamen cudgels that are cool, but I'm not sure if they were in at Kunark launch.
I'd say For 99% of the playerbase, it's probably not worth the effort.
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