Maybe I'm lucky to be in MD, relatively close to DFH's brewery, but the DFH beers I can get that are significantly more expensive than other "craft" beers are typically the high ABV, high hop varieties.
Given that, I understand why certain brews are more expensive, and I'm willing to pay for the ones I like (like 90 min).
I agree; SN Torpedo is nothing like DFH 90 min; I'm not sure why someone would make the comparison. Torpedo was a godawful resiny hop-tea mess to me, and I wound up dumping more of it than I drank. I strongly dislike most American IPAs because they're ridiculously hopped out of all proportion to the other flavors in the beer, and Torpedo was no exception. I find DFH 90 min to be an exception, and it's one of the few I not only drink, but genuinely enjoy. The fact the a 4-pack is $12-14 around here isn't going to make me enjoy Torpedo at $9/6-pack. If someone honestly tastes no difference between the two, then sure, pay less money for Torpedo.
Why wouldn't you expect DFH 90 to be more than any of those other beers; it's a way bigger beer. Bigger ABV, bigger grain bill, 50% more hops, etc... It also tastes nothing like any of the others you listed (I haven't had the Lagunitas, so I'll reserve judgment on that one).
If you want to compare 60 min to those others, then fine, that's a more fair comparison (and a much smaller price difference).