We need more ways to make gold in this game.

[Nash]

You're going to have to explain how anything sold on the auction house takes money out of the economy. That doesn't make any sense.

Selling something on the auction house does not actually generate any gil into the economy. Gil is transferred from one player to another. In addition, the auction house takes a fee which is usually a percentage cut of the transaction. On the whole, gil is actually lost from the economy in the process of a transaction.

What OP is describing is the fact that there are a vast number of large gil sinks on the game but, after drying up all of your sidequests, only a very small amount of actual gil acquisition opportunities. Sure, you can take other people's gil, but as a whole the amount of gil entering the economy for a single character seems to be smaller than the amount of gil that is required in daily maintenance of a level 50 battle character.