Has anyone ever done a study (and could you point me to it if so) on the later lives of these "mixed African cichlids"? It is not unusual in nature for closely related species to be able to breed--think horses and donkeys--but the usual outcome is that the offspring are sterile (mules.) So perhaps the "o noez, do not give/sell these to anyone else, it will ruin the gene pool and corrupt the hobby" reactions might be a bit overzealous?
If someone finds these fish attractive, and I admit I am among that group, why should the owner not be able to dispose of them as he or she likes to a willing and fully informed buyer? So long, of course, as they are accurately described in terms of heritage and not misrepresented as purebreds.
/contrarian post for the day.