Believe it or not, fRO's economy is more balanced than you might think, and it is highly influenced by our actions.
When i first joined the server prices were much higher(Gloom card 70~80 coupons, Kiel 65~70, etc) and in matter of weeks i saw those prices fall to less than half, then rise again...my first sinx card took me 80 coupons to buy back at my first week in the server >.>
In-flux of new players cauze this; they need the basic cards for their builds so the demand increases as the stock falls, once everyone's happy and stocks start increasing, the price starts falling and so it goes.
Time heals...