I can understand that the way Anet implemented the special mission documents originally had to be adjusted because as they are tradeable, you could basically buy karma with gold, which defeats its intended purpose of being the main account bound currency in the game.
Yesterday before the patch, I was getting buy orders filled for an average of 15s, which adds up to price of 75g for 1 million karma, which I think we can all agree on is quite cheap, considering the amount of weeks it would take you to farm this kind of karma normally.
A legit question would be now why have these documents implemented in the first place?
Just have the 40 special missions available right away like regular achievements.
But I think the original karma faucet of 2k per excess document is kinda required in this zone and its removal surely will lower the average karma gain per completed meta quite a bit.
Why is this a problem?
Because there is a significant karma sink in this episode, which is the Tengu Weapon collection.
Each recipe costs 35k karma, so its 560k karma for the whole collection.
And I can see this becoming a huge bottleneck now for newer players who dont have a lot of excess karma stored because it will take significantly longer to earn this amount of karma on the map without the extra faucet from the documents.