Not as hard to keep? Price?
On the money.I thinktlindsey hit the nail right on the head. Most water provided by the city leans towards higher PH hard water. Since it's better to get fish that will thrive in your water supply instead of trying to alter the water to suit the fish, leads to much more CA being sold than SA.
No matter what vendor, they seem to sell out faster.
I should have said varieties not species. And another thing I remembered, in one local shop they have some very nice Aequidens metae. Got them as juveniles over a year ago, they are still there. During that time salvinis ,firemouths and convicts have all come and gone.They are advertising over 50 species
This is closer to what I've seen where I live/have lived. SA vs. African depends on the shop, some are more SA dominated, some more or less equal, others more Africans. Where I've lived I haven't seen any that are primarily CA, though some have a decent CA selection. If you count angelfish and discus, aside from a few African oriented shops, it's no contest anywhere that I've lived.The water chemistry issue should indeed explain this disparity, if one even exists. But in reality, when I worked in a pet/aquarium store decades ago, I would say that no more than 10% of customers had a clue what any of that even means.
...based upon what I saw ten years ago, there is absolutely no such bias towards CA over SA cichlids. This might be a regional thing, I don't know...but if any group of cichlids seemed and seems to be pulling ahead of others in terms of popularity, I would say that it is the Africans.



Even here in Ecuador where we have soft water, there is not usually a good selection of South American cichlids available in shops.