Sorry my friend but bovine excrement is my theory on that. I played remix a lot and completed the every quest on one character. I walked away with 14k on my first that entered. And finding buyers for that amount of gems is Walter Mitty territory.
So pictures or it didn’t happen.
Sure, let me go back in time and make screenshots. 
If I would have known this discussion would come up 6 months later, I might have made the effort of screening what are still peanuts for someone that has no problem earning 100k+ in a day on retail even now when it´s slow.
And remember, every player with a full gear set had 21 gem slots… I mean no disrespect, but ifou really think it´s hard to find 5-10 people /day willing to spend a few hundred gold of the otherwise completely useless 10-20k they had accumulated, just not to have to deal with gems, I feel that you may severely underestimate the laziness of the average wow player.
Again, you may doubt it, and that´s your good right snce I dont have proof to present, but it doesn´t change the truth. Just try it yourself during Legion remix in a few months (if they keep teh gemming system the way it was) and you can thank me afterwards, no harm no foul 
I cant say I get surprised for many things with wow anymore, but sometimes they manage make things for the worse and I wish they would do something to fix it or admit the mistake sooner. Shuffle healer issues by gaining rating less than dps is 3 years old now and a lot healers stop healing it 2 year ago, the ques are very long. It would be beneficial to make the mode worth the healers time respectfully same as for dps atleast 