Where does all the gil come from?
After 5 months of play, without crafting I have about 1.5 million gil.
I recently started gathering/crafting and have made an additional 750k in the last week or so.

Considering all the gil in the game comes from selling items to NPCs or drops from monsters/dungeons how do people earn enough to buy what they want off the marketboard?

Basically as there's a finite-ish level of gil in the game and you pay for things like teleports I'm trying to find out how you can have items selling for what they do.
As there aren't that many crafters/gatherers and you can charge 100k plus for many items.

So some people basically have to have millions upon millions of gil from farming.
Is there some rewarding activity I'm missing? Or is it just because people have played forever? (though by my count they should still have only earned like 10-15 million max with dungeon drops).

Unless (conspiracy theory hats/joke incoming):
SE randomly buys items off the marketboard to stimulate gil creation?