Got to go play at Xtreme Raceway Park again Sunday

You may notice in the video that reaction time and e.t. were not posted for the left lane. Over 50% of the cars that come to this track for tnt ask for "NO Time" on their window. Why do people do this? Embarrassment? Don't want their heads up competitors to know how they're doing? Other? Any thoughts?
At my old track in Central Texas a bunch of guys would show up on Friday nights in their newer street cars, park them together, open up the hoods and stand if front of them with their arms folded. They would never make a pass! When it came time for the street shootout, they would leave. What's up with that?