Note, even track demons seldom break 155 mph, and even then, briefly.
Driving 180 mph isn't very useful. It's not fast enough to set Texas Mile records. It unnecessary to lap a road course. You can't run NASCAR ovals, and cheap cars go over 200mph if it's a 'pecker measuring contest'. Got $63k burning a whole in your pocket? You can buy new for that. Poor? 200 mph cars start about $45k in good shape.
More curious is that the Pure Track Variants aren't the fastest cars. Downforce does more to drop lap times than mph over 150, so they trade speed that won't be used, for cornering and braking timing.
Cliff Notes - Lots of 150 mph cars will make "200 mph" cars 'squeal like a pig' from Deliverance when it comes to lap times. Nothing under 250mph is setting LSR records anymore.