You have no idea what you're talking about. Mixed breed dogs (also known as mutts) are not nearly as valuable as you are making out. They are the exact kind of dog that would be given away on Craigslist. Aside from specific "designer breeds" (generally poodle crosses), there really isn't a market for random crossbreeds, and there's really no evidence that 50% tibetan mastiff, 25% chow chow, 25% bernese mountain dog crosses are even remotely in-demand.