I can't believe such a bad exploit went unnoticed during the PTR. Yikes.
This and that other "exploit" that gives a player massive XP by playing on T6 by completing bounties that do not require killing any mobs has really made the 'season' concept a complete joke. I'm still playing my season character because a buddy is playing his, but I haven't even cracked open the leader boards since the first day.
Be interesting to see what Blizzard does to the folks who took advantage of the exploit. It is Blizzard's fault that the exploit existed in the first place. The damage may already be done.