When I first came to Spiral Knights, around 4500 crowns are needed to buy 100CE, but now you must pay around 6100 crowns to get 100CE. I think that Three Rings should really do something to lower the prices, especially after the update where we now have to pay much more energy to craft 3* and 3*+ weapons. I want to play this game F2P, but it will become harder and eventually impossible if the prices are just going to go up like that. Who knows what might happen in the next week, it could become 7000 crowns for 100CE and if it's going to go higher, I will have go for more than one JK run to get 100CE.
Update: It's now nearly 7000
Update (19/11/2011): It is now over 7000
I'm not so sure the CE market needs to be regulated. Currently the economy is based on updates and how well OOO is getting payed. When new updates come out people buy more CE which causes the price to inflate, and if people buy less CE the price inflates. The opposite is true to. So, no, OOO has it right. The players are controlling their own economy and it's working fine. If CE prices soar like people expect them too, that only means that people aren't buying CE, or someone is manipulating the market. If someone does manipulate the market in such a way though I'm sure OOO will do something about it.