I was recently talking to a local would-be BP breeder who was thinking of buying a het ghost male from another local breeder. He asked me (pretty much direct quote): "Now, I asked him [the seller] this and he just wouldn't give me a straight answer: If I breed the het ghost to a normal female, how many ghosts would I get?"
I asked him if the theoretical normal female was het ghost, and he said no. He seemed pretty disappointed when I told him, "None."
There's no doubt in my mind that the seller of the het ghost knew EXACTLY how many ghosts you get from breeding a het ghost to a normal; he just knew that telling the buyer that wouldn't make him a sale.