The sports share trading system provides a web site in which users, using real money, trade equitable shares of athletes in a closed market. Rookie sports cards are tokens representing the shares of stock in the athletes and are traded as financial instruments via the web site. Users who buy cards, i.e., shares of stock, and keep them in the market are eligible for bonuses and guaranteed buy-backs if they choose. A Hall-of-Fame guaranteed buy back rewards users owning shares representing athletes who reach predetermined performance levels designated as “Hall of Fame Tiers”. The buy-back offers are at a predetermined, published, guaranteed price, representing a conditionally guaranteed future value of all purchases. The self-contained trading platform web site is accessible by a variety of web-enabled devices.