From his post, he try to reselling the card..
TG card alywas got high demand compare to other card but for the price, it should depend on supply too..like right now, there is like 10 TG card around the market..
so if you plan to sell it for high price, you might gonna take some time (or maybe you force to reduce the price if the demand sucks for pretty long time)..
Doppel is kinda cheap right now..it easy to get the card for 29-30m..
for card like DL, the demand isn't really high but supply isn't much too..so when you selling this card, you can put more high price than usual (probably 33-35m) since you monopolize the market..
I can't really recommend which card you should buy from item shop..the demand and supply for this server always change..like this week, the price of card probably 30m but next week, it might increase to 35m..maybe your best option is between TG & DL (maybe berzebub too)