I know you're not new here, but we say this a lot...
"First time on Jsp?"
Idk about POE2, but in D4 season 9 for example, duped mats tank in-game gold rate down to like 2fg per billion within the first week.
Now the dupers have moved on, that same in-game gold 1billion = 30-35fg per now.
It's just how the game/market/dupers/botters/etc etc goes. Affects everything.