Where as Nadia DOES provide a method to remove wealth from the system, it is too hap hazard. If an adventurer only needs comps he can easily get himself, Nadia does nothing to remove wealth from that player. You still only have the creation and distribution sides of an economy. In the real world, we have forced consumption. If you don't consume your wealth at least by buying food, you die. I know folks don't want to be "forced" into anything, but the lack of limits has broken the economy as it is now.
EDIT: Ok... no sickness, nor forceing. Just a potion sold ONLY by vendors, ( thus acting as a money sink ) for 24 in game hours. The potion would buff you in two stats only, the primary stat for your current adventure class, and the primary stat for your craft class.
Like a mage/miner would have Power/Strength buffed.
The potions would come in tiered versions as follows.
T1 buffs stats +100 - COST: 500c - DURATION: 24 in game hours.
T2 buffs stats +200 - COST: 2s - DURATION: 24 in game hours.
T3 buffs stats +400 - COST: 4s - DURATION: 24 in game hours.
T4 buffs stats +800 - COST: 8s - DURATION: 24 in game hours.
T5 buffs stats +1000 - COST: 10s - DURATION: 24 in game hours.
This potion would stack with bolster potions and buffs, but only be usable once in any given 24 hour in game period, and could be removed to switch to other classes, but would have to use another potion to buff again. An added bonus to this would be that any player could use any tier of potion. Thus if you had the funds you could boost your pwr/str stat, and thus increase your stats in such things as mining, or damage from spells.
This is just an example of one way to remove wealth and still add benefit.