I wouldn't really call it abuse, it's just using the car for what it was designed for. Plus what is the point of making your car accelerate and stop faster, and handle better if you can't reap the benefits on the street.
Plus auto-x can show you your limits, the limits of your car, which will make you a better driver on the street.
It can be competitive if you let it, but above all it's fun. I love it.
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."