Its because I believe in America lots of places like Petsmart and walmart sell poor condition hybrid fish but I've never really came across hybrids unless they were sold as hybrids, and even then they weren't exactly cheap because of their "exotic" look. sometimes peopel are just wrong and see what they want to see. for instance they see seperate qualities of one species and then they assume its a hybrid instead of realising that a single fish can have these joint characteristics, I've been guilty of this as we all have at some point or another.
Sometimes there is something about a fish that's just a bit off (like my Chocolate cichlid thread) the fish could be a cross between two localities of the same fish and therefore have different traits, or maybe even a fish could have some deformity such as SB deformity, most people on here would probably hypothesise that the fish is half jellybean/bloodparrot whereas in reality the SB gene exists in many different fish species as a naturally occurring (and farm bred trait) much like Albinism and other colour conditions.
We have all seen the typical 2" stress barred JD/RD/Festae whatever that looks like about 70% of all 2" stressed CA/SA cichlids and people see what they want to see.