Rare is kind of a funny term in the hobby, because what might be rare in California might be a glut situation in Chicago ( a bastion of cichlids in the hobby).
I know when I had spawning pairs of haitiiensus in the Chicago/Milwaukee area, I had a hard time giving them away, and in some other places hobbyists thought they were rare.
It may also be a representation of the actual range on the fish in nature. A altoflavus come from very limited range in north eastern Panama in the vicinity of Bocas del Toro, and this area now ravaged with Covid, being kind of cultish loose tourist area, may make it even more rare in the future unless someone(like Sam) is breeding it. When I lived near Chicago, to me there are very few rare cichlids.
I remember at an American Cichlid Assn convention both Sam and I mean mugging each other as we were both bidding and running up the price on some of the same rare Theraps bulleri, or was it irregularis? In the end we each ended up with some, if I remember right.
The only few cichlids I can conjure up in my mind as rare at the moment are Nandopsis ramsdeni from Cuba, and Iranocichla hormuzensus from Iran.
The last time I saw them for sale, they ran $300- $500 each.