I wonder if DD actually sold any at that price point. Amazon is known for offering different prices to different people continuously fine tuning prices to find the most profitable sweet spot (which changes over time).
I've seen some limited edition corals online that I was sure were limited edition only in the sense that "We have only two Limited Edition frags priced at $120. All of the other frags from the same mother colony are priced at $15". The people who buy them are the same people for whom the argument "Yes, but this one goes to 11" makes sense.