Neat Idea, especially in games like Fifa and Madden but with this there is just no stability in prices.
I think in years to come in MyTeam you'll see things start to carry stability , but
I'll sell cards one day for 2,000 and then the next night it'll sell for 5K. It almost seems like prices vary more about time zones than actual cards lol
Thursdays , prices are discounted (I assume due to throwback packs and ppl just selling things to try and get a few coins to feed an addiction)
Friday nights and Saturday nights are the most unstable and then week nights seem to be the best time to be a seller.
Never the less! this doc idea could serve as a base if nothing else