The price devaluation on NPC vendors only happens with stacked items, commodities, like ingots, gems, wood, etc.
It doesn't happen on shields, bows, tables, etc. That's what needs addressing.
There's a big difference in making a calculated amount each hour, then waiting for players to buy things. Might as well do both, but from an organization standpoint it'd be silly to rely on the player market when you can manufacture you're own gold.
Convincing you of this being a real issue is not my concern, lol. The point is to show a flaw to the Developers that allows bulk gold to be created.
Nothing more.
Flaws need attention drawn to them when they have the potential to ruin things... yes people are doing this, I didn't just make this up.
You don't have to believe me, just believe the math