SportsCardInvestor's Geoff Wilson joins the Sports Card Grinders to talk about the state of the card market. As we have another record sale of a Mike Trout rookie card for $4 million, we examine if the market is overheating or are the major brands taking the necessary precautions to prevent a repeat of the 1990's junk wax era? Plus we take a look at the price action in NBA cards during the playoffs and how we might want to approach buying football cards before the start of the NFL season.