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$75 dollars doesn't seem overwhelming to me. I mean, it's 3 volumes. I didn't hesitate to pop down 20 dolloars a pop for Top 10, or any of Moore's other works. Simple math means this isn't so outrageous. I'm sure that the higher price also comes of the fact that it's intended to be kept out of the hands of the underaged.
By putting it all together, and slapping a initially daunting price tag on it, you also lend it credibility as artwork. If it was released one issue at a time for a run of 25 issues at 3 bucks a pop, it'd have a really different feel to it.
I don't suppose people would have anything to complain about the price of it then though. That'd be pretty much standard cost for comics these days.