While you help the Racer species, you can profit as well. The Racer NFTs will command significant value because each can be used to earn money by racing, as well as create additional Racers by evolving. You are free to sell your Racers or do whatever you want with them. In addition, Racers with better sets of attributes (i.e., more speed, acceleration, etc.) will be even more rare and valuable, since they will allow you to more easily win races and rank higher in tournaments.