Just think about it a bit. The reason the females are cheap is because they are unregsitered. All the offspring will be unregsitered too so they too will only sell cheaply. Is it worth getting into such a cycle?
By the way, before you get enticed by Mangalitzas because they sell for a premium, bear in mind that once numbers increase, the price will come down to the same level as other breeds. Don't fall into the trap of buying high and then, by the time you have stock on the ground to sell, the price has collapsed.