Your main reward is that it doesn't look like complete garbage when you have to go there to get to Gangos.

After that, there's the weekly donation that marks up the buying price for items filling up your inventory. A good way to burn company seals is to buy those items that have NPC sell price of 360 and turn them into Doma.

Then there's a vendor that sells a couple of items only available through them. Off the top of my head I remember a glam, a furnishing, and an item for making the Sadu minion.

But it's still a part of the game and you should do it for the game's sake. It doesn't take much except selling your worthless junk. It still irks me that there are people who are willing to sit for 8 hours waiting for Chi but will skip cutscenes and other optional content. To each their own I guess.