Unfortunately I do have a fairly decent idea what I’m talking about, as the gdkp hosts I played with keep ledgers and show their cut. 100-150k per raid (just the host cut, they also take a raider cut because they well raid) since Ulduar, and they do it 5-15(!) times a week especially now with 50/50 togc being quick in and outs… I know I know, all this gold just goes back into the economy and totally isn’t sold on g2g.
Oh and by the by, my arena partner recently got perma’d for gold selling specifically and no, it’s not “hard”. Make contact at g2g, offload bulk.