There is a limit on the amount of pinks you can do in a certain time. Not sure the amount or time but this happened to my teams leader and he couldn't race for almost 2 weeks.
Think about this: Everyone wants the prize car. It costs $40,000 to make a team. One person could spend that amount of money and then receive every prize car. Every prize car would literally have no value. Prices would drop and money would not become a problem for anyone.