I agree that racing another sports car is as natural as breathing for competitive people. Before I raced on the track, I raced on the street. I look back now and realize how utterly stupid that was, but at the time, I was very into it. If any of you got buzzed by some dumb kid in a beat up CRX 10 yrs ago, that was probably me.
Most recently, I had a 247whp miata, and though I wouldn't go looking for races, if some fart-can equipped civic with 20" rims started revving their engine at me, I would show them what a 12sec pass looks like.
Now, I love squeezing every last tenth of a second I can get out of a course, and if there's someone close to my speed, I'll race them. It's just nice to have safety equipment, corner workers, one way traffic, competent drivers, and no cops!