Serious it's when I run the ET Summit NHRA points races. It's called the Tire Smoke Rule - If track staffing views excessive braking the following shall take place; 1st Infraction will be given a warning, 2nd warning shall be a disqualification. Now I could see some fool locking them up on the top end, but from what the regulars tell me it's for guys sandbagging.
When I run street trophy, it's against more normal street racers and they are hitting their brakes all the time. Heck it should be called sandbagger's street trophy. With these other hardcore guys, they run like 12.105 on a 12.10 dial. They are freaking awesome, I just hit better reaction times and it's enough. A quick way to get black balled is to be a sand bagger, they don't like it one bit. It's like heads up but on a dial.