Now that Kai Zaiken's offerings are no longer necessary--and are pretty lackluster--I suggest that you give him something worth spending a boatload of credits (not other currency. CREDITS).
Have Kai offer a random selection (3-5) of old Cartel and adaptable loot drops that change from week to week. All types of armor, weapons, decos, deeds to strongholds, handler's permits, etc., all at silver-platinum (including old purples). Make them worth buying for a ton of credits, bound to legacy,, and people will spend for their collections, and for the novelty. This will take a boatload of credits out of the population on a weekly basis, and people will be happy to have stuff unavailable anywhere else in the game. I know I would.
Cheers, and thanks for a terrific game.