Tcolt, every breeder of anybreed is gonna have culls. If they don't, they're most likely just breeding for the cash.
And if they tell you they don't have any culls...run away as fast as you can. Their either liars, or their standards are too low (and that goes for dogs/breeders of any breed).
I really don't understand why always the comparison's to APBTs. But, the fact of the matter is that most don't know what a true (real) APBT is. Always get a good laugh out of those asking about "Blue nose", "gator mouth", etc.