The Vorlons are the great unknown. They occupy a *huge* sector of
space. No expedition ever sent to Vorlon space has ever returned, or
sent back word. No human had ever even *seen* a Vorlon prior to Kosh's
arrival on B5. Their technology is vastly superior to just about everyone
else's. To unravel the mystery, to maybe get a *piece* of their tech, is
more than sufficient inducement, I'd think.