From what I have read and been told by breeders, the Bulldog breeds are more difficult to breed and there are some big expenses inherent. Evidently the females aren't terribly energetic pushers during labor either, so on top of all the screenings you have to do for so many of the possible health problems in the parents, ceasarian section deliveries are an expense routinely incurred. They also typically have small litters as well, driving the cost of each surviving pup up considerably.