I think PDXs or HPDE serve a purpose for a up and coming race car driver to get over his first time on track jitters, but sadly enough they are turning into something else. What these types of events are turning into is idiots in fast cars driving way over thier head being taught by very low level of skill instructors, most of these PDXs or HPDE don't pay instructors or pay them peanuts so most talented racers could care less about instructing these events, and all you get is guys with egos, rather than talent.
I give you all an example when I finished my SCCA FP car back in the late 90s, I wanted to go back to SCCA drivers school, maybe I could have got waived to a regional license, but I decided I would go back to atleast one school. Well SCCA drivers school are spread out thru the season and I wnet to a Car Guys school just to get some seat time, now mind you I had already held a SCCA national license in the past, been to a couple of runoffs as driver, and probably had 25 SCCA wins under my belt. My instructor while a nice guy, didn't have a clue, he kept trying to get me to take off my rear sway bar off, gave me all kind of bad advice about lines at Road Atlanta. He made me me follow him for two session, this poor guy couldn't find a apex with a magnifying glass, finally on the third seesion he told me he would lead me out and after a couple of laps would give me a passing signal and to see if I could stay in front of him. Well sure enough he gave the passing signal, I passed him and after the back straight I never saw him again, my crew reported to me I was turning 8 seconds a lap faster than him. I can tell you I was not impressed by what I saw a Car Guys, I saw people in Porsches, Corvettes, Ferraris, heck even a 333SP Ferrari sport racer, blasting down straight and parking in corners, when a MG Midget race car can turn faster lap times than a 333SP Ferrari sport racer, then someone is not doing a good job of instructing or driving. Personally I think it ought to be law or something for rookie track day guys, nothing over 200hp, until you know what you're doing. We've got way too many rich, untalented folks out there driving super cars way above their talent range.