If they're overpriced "glorified taped sets," I'm genuinely curious how much do you think they should cost in the current marketplace? I'm not asking how much you would be willing to pay -- that's a different question, and I don't think you should pay a dime more than it's worth to you.
I have all of them and think they sound great and have really nice packaging, including high-quality booklets with photos, interviews, and researched/written backstories. The label is very small and, to the extent these are only "glorified taped sets," making them sound as good as they do only increases production costs (e.g. paying Grundman), which are undoubtedly high after all the time/expense associated with the production/marketing/sales/distribution/shipping processes for a set of this quality, including paying the rights holders. This isn't Chad charging $40 for repressing a single disc from an existing plate using existing artwork.
Put another way, if Sound Detective sold every copy at full retail, do you really think they'd be making big $$$ off this endeavor? I find that hard to believe based on my knowledge of this industry (admittedly limited) but much more comprehensive knowledge of other businesses/industries.