Not saying that this isn't RMT for sure, however......
Timeworn Map parties, FC's, and LS' are a thing, even an individual can be a map-hound.
While one can only obtain on their own via DoL jobs at a rate of one map a day, one can also obtain as many maps as they can get from trading them from other players or buying them cheaply on market boards.
It seems all the items you listed have some material that is ultimately obtained from a Timeworn Map chest, in various levels of rarity.
It would not be very hard to obtain a bulk of materials from farming Timeworn Maps, producing the glamor items from the materials, then use the proceeds to fund map harvesting, while still turning a profit.
Managed correctly, one could self-sustain a map-hound hobby this way and have a net gain in Gil.