Sports Card Strategy Show Special Edition From The National: Who Is GM 10? What Is GM 10?

Have you seen those guys in pinstripe jerseys with Slabby 10 on
the back, some of them with their stomachs hanging out. They
bring the energy at large card shows and they have an app. But
what does it do? They're fun guys, but is their app helpful to
the hobby? Let's find out on this special episode of Sports Card
Strategy.