What is "this" that needs to be handled properly?
What are the repercussions you expect to occur if it isn't?
Trying to draw direct comparisons between the game and real world economies doesn't work. The game lacks limitations that keeps some checks on real world economies.
The game generates fresh currency faster than it draws it permanently back out of circulation.
The game has no limit on how much material resources can be gathered over a period of time, how many of an item can be manufactured or how many players can choose to be producers of items.
Once a player has sufficient standing with their Grand Company and DoH/DoL classes unlocked, there is almost no need for gil at all when it comes to progressing a character through the MSQ. Gil becomes a tool of convenience, not necessity, and convenience is a luxury with no objective set value. Different people will pay different prices for convenience depending on their desire for it and the other ways they have to access what they are trying to get. Players willing to provide convenience value their time differently and so choose to set different prices.
To my knowledge, the only repercussion seen in chaotic MMO game economies over the years has been new players feeling like they've been priced out of being able to get the things they need for initial progression in the game and so they quit. The developers have slashed the amount of currency generated by game activity to keep inflation in check and used other methods to make it easier for new players to get the items needed for early progression in response.
That wouldn't be necessary here. The game already provides the minimum needed for progression throughout the MSQ until the player reaches the current level cap and level cap content. Obtaining things from other players while leveling is convenience only, not necessity.
Somehow I don't think vendoring the item amounts to the "screw you" that poster is trying to achieve.