Earlier quoted context omitted.
Far-over-median priced vehicles will still drag up the average.
Yes, but... How many used cars are sold in a year? It's got to be more than a million, doesn't it? So, yes, that $15 million Porsche drives up the average price... by $15. That's not significant.
That puts used car sales (including private sales) at around 22 million units, and nearly 40M total cars sold and registered in the US in 2016.
Regardless, if someone wants to complain about expensive classic cars, Porsches aren't the ones to complain about, with most (bulk being 911s from '78 - '93) trading hands well under $100K (964s being more like $50-65K, SCs more like $20-30K) despite the Porsche bubble that's been growing for a long while now -- since Ferraris long ago got too expensive for first time classic car buyers.