Can you add an inflation rate to the market to keep the outrageous inflation of these prices in check? All of the collector cards are in the 100000's!
Limiting the amount of clintz awarded/available, opening the availablity of collector cards and adding an interest rate to market sales (you already have a bank fee) will help get the market into a usable shape.
Basic economics here -- sellers are going for what the market can bear and stagnating the market when no one can bear to buy any of the cards.
Maybe a timeout on how long a card can be for sale before a very high daily fee is assessed on the seller.
Right now people leave these cards on the market at 100000 clintz and hope someone will buy it. Next person sees these cards are there for x amount and do the same. etc etc
However you forget the simple concept of supply and Demand. People want the collecters cards because well most of them are good, and they are no longer available. DJKorr for example, is stupid good. The demand for him is high. And in a real market there will always be cards people can't afford. That's just the way things work. It's not impossible or truly that expensive to get lots of credits. Within a short time (about a week) I was easily able to gather 40k credits, and really, that's slow.
200k isn't a fair price, but consider that it's also the way things work. When they don't sell often people will put them up at a lower price, or they'll be convienced someone will eventually buy it at that price. Also consider there are people who can afford 200k if they chose to.
But suply and demand is ofset by sooo many variables in the real world so we don't get a stagnate market place. That's the whole point of a federal moentary system. Supply and demand is a good driving force but can't ensure a steady marketplace in any reality -- including Clintz City.
Sadly it is not meant to be easy to collect all the cards. The people who have been here from the start will have a better chance at collecting all the cards, where those of us who joined late, so to speak, when there are already collections cards out there will have a harder time collecting them all.
It is just the way these things work really. Rare cares will be more expensive than the more common ones. As long as people are willing to pay, the cards will remain at those prices.