I have all the pets, toys and the mount. I got the Recipe Rat and his recipe so there seems to be nothing left to do in there, unless I am missing something.
Is there any reason to keep going in there? The vault changes weekly I know that, but it seems like the loot is the same every week. The crafting reagents are of no use for me, since they are soulbound and none of my professions use them.
well if you have everything, and you’ve done all the content there the best answer would be no right?
Nope. No reason.
Nope. 
Unless you enjoy it.
I just went back and did them the other day for annulet gem things because those are still good.
I did Zskera Vaults 3 times (3 weeks) during 10.0.7. I made 2 Annulet rings. On the 3rd run, I was just curious to see what kind of puzzles it would have. I solved all of them. And never came back.
On 10.1, I had 6 spare keys left. Instead of destroying it, I used it. To my surprise, I was able to get the last 2 items I need for Mossy Mammoth mount.
I believe we would return to Zskera Vault later on Season 2 for a 2nd round of Annulet ring for Season 2. It might be on 10.1.7 on the schedule. It’s just on my head. I am not sure if it would happen.
You done. Aside from rep grinds and profession knowledge on the mainlands, you can go to the new grindzone now.
Good source of DE mats. Convert the gems to fragments, convert the fragments to rings, DE.