This is for People hate to wait their mist energy to refill to pay for elevator fee.
So, I have come up an idea, which require co-operation(a lot :/). When ce price is low, you can buy as many ce as you could. When the ce price is high, you could sell all the ce you buy and you would earn the price difference. However, it require co-operation since the amount of people buy ce will affect the ce price, so it also make it harder to work. An example of this method is, if the ce price is 7700cr, we don't buy the ce to make the price low. After a while, with the ce price low, like 5500cr, we will buy ce. Then we will sell the ce, the result is that you earn 2200 cr for selling each 100ce.
If you have any suggestion to improve this method, Post :D, we all want knight too be rich man :D.
Sadly, there's pretty much no way to coordinate enough of the community to do something like that. Especially since it requires a lot of the community to be buying and selling at the wrong times so you have people to buy from and sell to.