1. Part
So Blackrock released their new honor system for which you can get any kind of transmog basically, but it takes long to farm. Now you get 180 honor (+some % depending on rating) for an arena win and 60 honor (+ some% from depending on rating) for a loss. Basically you can make another account and spam queue 2v2 without joining the game and you will get 60 honor every 30 seconds since 2v2 is very active. Now get some bot/script/click tool or manually farm. I made ~100k honor per hour using 6 accounts.
2. Part
if you can crash the server its easy to dupe arena cases. simply go to the "case trader" vendor and sell "x" arena cases. > crash the server > login back and you've got all your cases + you've got them in the case trader since it gets saved separately. so you can easily buy them back.
hope this helps a little bit