Originally Posted by Proterean
The marketplace will work in a way so it detects automatically how many items were obtained in the game. After the marketplace detects that the item has been obtained enough times (e.g 10-15 times) it will be added automatically to the marketplace.
There's thresholds for different items. More important items require higher amounts of obtaining in the game. This is how the marketplace works. PvE guilds that raid will always have better gear. This is how our marketplaces always worked, it is simply that we have not had a similar realm in ages.