Ed, here's a perfect example from that same event you were at. The camera car is an M3 convertible. At 7:45, he gets passed by a guy in a Z3 coupe. By rights, that M3 should be able to walk the Z3 in the straights, pretty much everywhere, but he can't. He can't even keep up. Why is that? Compare their lines.
The M3 driver is turning in way too early, apexing too early, running out of track on the exit, which is delaying his throttle application, while the Z3 disappears down the straight. The Z3 driver is turning in later, apexing later, getting his turning done earlier, getting the steering unwound earlier, and getting on the gas way earlier. Consequently, he's leaving the M3 in his dust.
The Z3 may be in novice group but he's driving like he's done this before. The M3 driver is exhibiting the #2 problem that plagues many drivers their entire driving career...turning in and apexing too early. (The #1 problem is not looking far enough ahead of the car).
People who never get in-car instruction, or dismiss it as unecessary in their attempt to solo as soon and as much as possible, can go their whole lives driving like M3 guy and never know any better. They'll pour money into suspension and power mods, give up, blame the car, buy a more capable one, still drive it below its potential.
Other guys have people teach them how to do it the right way, spend their time perfecting their approach and their car control skills, and laugh their asses off when they get asked what kind of power adder they have on their N/A cars.