"What is the relation between Crystal Energy and Mist Energy? They both serve the same purpose, so must be made of the same type of stuff just in different forms. So why do we have two forms? Well, the Mist Energy we know actually condenses into the Crystal Energy deep underground in the Clockworks. So to say, Crystal Energy is just a condensed and crystallized Mist Energy, and thus researchers at Spiral HQ are looking into technology that would allow one to put their mist tank aside and rely on Crystal Energy only for a while, while the Mist Tank collects mist energy and condenses it down into a much denser Crystal Energy. This wondrous contraption would be called:
The Misthallizer."

Above would be what I can imagine as the release notice for my idea. The whole reason for having this is one: I've heard people complain that you can ONLY play the game by buying Crystal Energy. Or if not you, someone else. I've also heard people talk and argue a bit about how it doesn't make sense how some vendors take Mist Energy (How do they store it, what is it used for? This all gets answered with this.)

But the biggest reason I can think of is those who are simply taking a break from this game. They can deposit their mist tank into the Misthallizer and watch as their mist accumulates over the course of their absence. At a conversion ratio of 5-1 ME-CE, if you get 100 Mist a day, then you'd get 20 CE a day. so if you were gone for a month (30 days or so) you'd have 600 CE by then. This also would NOT discourage the buying of CE, seeing as the smallest package is ten times this value, and would take a year of not playing to accumulate. If OOO thinks this is unbalanced in favor of the player, hell turn the ratio to 10-1, or if it's seeming unbalanced in favor of the company, turn it up (doubtful they'll see it this way :P). But it's just my take on this in a way that would help keep some of the "immersion" in the game while adding an F2P way to get CE, thus making it so that people could sell CE higher and tell the F2P players "Get it on your own if you don't want it for this much".

But hey, i'm not perfect at seeing how this might affect a game. What do you guys think?

EDIT: When I thought of this I only saw it as a convenience because I had completely forgot that with every MMO comes people that want to exploit everything that might not be balanced to the perfect degree. Sorry I forgot about that, but I thought you were limited to one mist tank per computer anyway. Guess me assuming that everyone is going to be good is something I need to learn not to default to.