The funny thing about car owners is that they love their cars very much and they don't like it to be damage or even get dirt. Yet, when it is old, they don't care what happened to it. However, in a derby game, racers aren't going to use old cars since they want to win the derby.
In this game, you will need to destroy other cars to win the game. Each car that you destroy will give you a huge sum, but that won't be the only way to gain money. You can also gain money by damaging other cars. You can use the money to upgrade your existing car or buy a better one.