The more you track your car, the more probable that certain horribles will occur. Eventually the track boogy man will bite you in some way. On the track you are maximizing almost every part in your car for very prolonged time periods,... and sometimes dealing with occasional and damaging OFF's. In real racing, it is the same, only multiplied many times, plus there is actual contact from other cars. Almost ALL things can break, and accidents do happen.
Choose tracks with the widest tarmacs and the largest and best run out areas. If there are walls, change your driver thinking when driving near them, completely! If you are a novice, get instruction each and every time that you go on track! Do NOT try to track a car by yourself until you have been completely OKed by a real instructor. If you are an expert, get peer instruction every chance you can! Don't ever grow too big to get better instruction.