David Robinson rookie cards have turned into surprising treasures for collectors, and their values have skyrocketed over recent years. The 1989 NBA Hoops Series 1 #138 card shows Robinson in a suit with his Spurs jersey and sold at an amazing $1,500 on eBay in February 2021 with a PSA 10 grade . Many collectors might think these cards are easy investments, but grade differences create huge value gaps. The value of David Robinson's most sought-after cards fluctuates dramatical