just like to suggest if possible to convert 100ME to CE and make a vendor that can convert it. of course, there's a payment for every transactions. it may cost a 25% of the CE, so your 100ME to 75CE. OR, cost of crowns for the payment.
this is a suggestion for the players who want to save their energy in weekdays(for student), and who have a bit of time to online for the whole day just to spend their energy and not wasting time. and i guess, they can't abuse this because it took a day to have a 100ME.
Well, sometimes I use 5 minutes of my free time (student too, btw) during my weekdays to login and craft something. Other than that, I completely ignore it.
Well, your ideia is nice, but easily abused. It's like, I can get easy money (CE, crowns) for NOT playing the game.