I disagree a bit about the idea of Dual Universe being that close to Second Life. Even less regarding money. Dual Universe is using the same model as EVE online.
DACs are PLEX, and work the very same way.
Economy will be driven by market orders, asked and fullfilled by players. Therefore their value will change depending on demand/offer.
DACs, like PLEX in EVE, are a special item. Subject to the same market rules, but these are different in that they have a fixed value in real money, and they can't be crafted. These properties give some stability to the item value and provide a reference for all the market.
Being suscription model and with DACs, NQ doesn't really have much to figure out. It is a very well tested scenario, and they do well in my opinion to follow something that works. I wouldn't change it. You want to make profit from an item crafted in game? Have your profit in game.