Sometimes the final yes or no has more to do with other considerations than just popularity. The Long Finned Batfish that I would like to see would take monumental collision detection and flow dynamics for the fins, for it to be included in the aquarium. With the room alloted in the tank it just isn't workable. Some of the others that have gotten the no vote are because of display problems from the color patterns in the fish, or for various other reasons.
Jim tries to include as many as popularity and reasonable success will allow. But I don't blame him for setting high standards. The results are obvious.