I have never had a pure black cat. When I was looking for a cat after my old girl died I wanted a ginger, and found an adorable ginger. Then I wanted a companion for her, and one of my coworkers was fostering a kitten that needed a home as she had a vacation scheduled. Color didn't matter. I just like cats, someday I will have a solid black cat.
There are actually way less superstitious people these days.
The last time I adopted a pure black cat I was told they were less adoptable because they are hard to photograph.
There are also more black cats born then other varieties which perpetuates the stereotype that they aren't adoptable. - There are actually more of them!
I only adopt black cats. The other colors always find me on their own. The stigma is still out there & now we are returning to the dark ages. There are no pets in this White House for the 1st time since the 1800's. I will provide sanctuary for all black cats.