You're correct in that nearly every collector I know owns an ACDC. It's been a very good pin for Stern, and they'll continue to run more as the distributors request them. Probably even a year or two from now, as the license isn't related to a film release or anything timely.
The TAF analogy is a decent one, in that lots want it, lots have it, and the price stays very reasonable because of the high production. ACDC is very simple standard layout, and relatively high production for this time, and the price will stay fairly stagnant on them I'd guess. The LE's seem to be demanding a premium (or at least people are asking a premium, not sure how many LE's are really selling at $10-12k) but that'll settle down, I'm guessing. SM Black went through a similar phase, and settled back down.
I echo the sentiments of those who are saying forget the value and just play the pins. I know it can be tough to decipher the truth from player reviews these days, simply because collectors have dollars on the brain... they hype their new machine like it's the greatest thing ever. (The first Avengers owners were insufferable in this regard: "Greatest machine ever made! Buy one while you can!!! HURRY!) LOL.. It's understandable with how much these things now cost, to try and justify your purchase and feel more secure about it. But like I said, it does get tough to get straight reviews and opinions these days. One of the other nasty side effects of the dramatic increase in prices.
Personally, I think a market correction would be a good thing right now. I think you're starting to see it with the Hulks, XMs, and even ACDC Prems hitting the market for less than NIB, which feels normal. HUO Sterns hitting the market for thousands more than NIB price, short months after release, feels very wrong and artificially inflated. I hope the guys who purchased their BIB's for $12k and TronLE's for $10,5k feel as good about their purchases in a few years as they do now. I'm guessing they will always love the pin they purchased, because they're great pins, but in a few years may not like the price they paid...
The market is just barely beginning to show the first signs of saturation, and yet there's a virtual avalanche of new pins from new companies to be added to the market very soon...in addition to the newest Sterns. We'll see...