Quoted from GregCon:

What gets me is not so much the prices, but that people are asking top-end prices for games that are not top-end. We can debate if a Whirlwind is worth $7K all day....my opinion is it might well be IF it's an especially nice example. But when it has hard-to-remedy and expensive-to-remedy issue issues...not so much.
But take a look at musclecar prices....a rusty '68-70 Charger that is missing lots of pieces and needs a complete re-do is highly sought after and brings big money.