Estimate card values using actual market price of same level card in USD.

This could allow sorting rentals by DEC income per day / actual price of same level card on the market in DEC, or if possible the average over the last 10 sales, or similar. So the idea is that this would allow easy comparison of how much a card is earning in DEC per day, and compare that with the price of buying that same card at the same level on the market, to quickly get an estimate of how much buying that card at the same level, and renting it, would earn. This would be instead (or in addition to) the actual method of estimating card value by level x low bcx price, which can be misleading in many cases. This would also be a new way to calculate worth of the collection, and may be be closer to what you could expect to get if you sold all the cards, since price per bcx varies for different cards at different levels.