It may be hard to believe given the massive success of Hustler's "Barely Legal" series, but according to a 2001 interview with "gentleman pornographer" and director Clive McLean quoted in his obituary on AVN today, the first title was barely solvent: "It was a big yawn as far as distributors were concerned ... It only went out the door at 700-800, not really good. We had no sales people. But the repeat orders were absolutely astronomical." As far as porn legacies are concerned, McLean's will be tough to beat.
"Clive McLean Passes Away" (AVN)
Clive McLean Videography (Adult Film Database; includes box covers and photo galleries)