Current Event Quest Master Difficulty is a joke (not for the reasons you think)
I'm actually half-tempted to post this as a bug, because there is no possible way this could be right...
Contest of Realms master difficulty unlocks at Summoner level 25, same as Heroic, has a team rating of 5500, but has enemies at 8K+ (going as high as 15K). That is HILARIOUSLY lop-sided to the point that unless you've whaled this game you have no chance. Not to mention that the rewards seem to be laughable to someone who could actually build a team to take on the quest at that difficulty.
I know I can drop down to Heroic and I'll definitely do that in the future. But you're clearly misleading the player into thinking they can do content they are clearly not capable of handling. That was not fun, not fun at all.
And when a game is not fun... then there's something dangerously wrong.