In NHL and NBA you can sell the cards back. But i find them way harder to flip for a profit. 2k is the hardest i find out of the games to flip bc they have a criminal 15% tax. In HUT you only get packs for collections and you cant sell those cards from the packs. And some of those teams are crazy hard to collect bc some cards used to cost 1 million coins. I havent played HUT in quite a few months though