I run Supergas and have run both Superstreet and Supercomp. I do it for 2 reasons: first, it gives me the opportunity to run divisional and national events, and 2nd, because I like the challenge. It's definately a challenge to set up a car to run a specific number run after run. Lot's of math etc....
I really prefer to run flat out, and when I bracket race, I do.....it's a heck of a lot easier to put a dial-in on the car than it is to run an index.
Johnny