They aren't a breeder. They are a flipper. They buy WC or CB in bulk at low costs and move them out quickly at cheaper prices to the public.
A lot of people don't agree with the business model - driving prices down, flooding the market with low quality stock, etc. I've bought from flippers before and had mixed results. You should go into it with your eyes open, and be prepared in case you get a WC animal with parasites, etc.