User blog comment:Drunkasaurus/Proposal for new currency for custom rewards/@comment-24411440-20140114041643

In order to keep a gold sink in the game, custom rewards could be changed so that they could cost either gold or aurum. Having too much or too little aurum would never be a problem; since the user sets their own reward costs, they could make it as easy or difficult as they want to earn custom rewards.

This system is less advantageous for users who already have a large gold surplus, but for people who want to actively upgrade their gear and still use custom rewards, it's difficult to balance custom reward costs so that they don't interfere with equipment acquisition but still cost enough for them to be considered significant.