The issue with prices being so high is that we are swimming in gold from leveling. This sets the market at a very high point. Sadly since this gold is 1(one) time infusion it is leading to the rampant inflation that you are concerned about.
FYI: Yoshi-P admitted at that there is a gil problem. They didn't plan on any surplus, hence the average player, i.e. the one that Yoshida wants to play this game, has very little rsecourse in gil generation. Which working with the above creates an issue. Now if your solution is to force a player to level a DoH/L then they may leave, and that create yet another problem all together.
To borrow something that other guy does. You the one from that company that's buying itself back from Vivendi and didn't book an extraordinary loss this year You should feel like you receive a benefit for doing something. Not a punishment for not doing that action.