The only problem with energy prices is that the material market is a completely unreliable source of income, and that's understandable (if frustrating sometimes) as this is a brand new game and markets, in games or otherwise are complex and difficult to set up properly.
All of this could be easily resolved by adding more ways to use up materials (a cheaper way to craft in bulk in order to get UV items, probably also adjust the % chance of getting them, perhaps by mitigating the energy/crowns costs if you craft several of the same item at a time) and adding an auction house to help establish common prices for various items.
The only actual issue is that you guys create more problem than an actual solution.