I do understand why some people would want to believe that freezing is humane--it's inconvenient to believe otherwise.
I'll go out on a limb and point out that instantaneous destruction of the brain actually is humane, though never approved by any veterinary standard, because it is perceived as being brutal (I've never understood that one--cattle are bolted through the brain to kill them for slaughter, after all).
There are euthanasia drugs approved for use in reptiles, now, though. If someone has to put down an animal, and they truly want to be humane, they should probably not freeze it to death. Even the chance that this method is painful should be enough to make a person seek one of the several alternative methods that are known to not be painful. The way it's always been done is not always the right way...or even usually the right way. Look how far we've come with reptile care in the past few decades.
As for normal males, that is part of the operating expenses of being a breeder. There are always people who want a nice pet python. Some of mine go to a local pet store, and some are sold directly. Down the road, I will probably find either more pet stores or a wholesaler to sell them to. I do have high standards, though, and I will be sniffing them out thoroughly before I let my babies go there. If that means keeping and feeding normal males for a while before I find buyers, well, that's a few more rats, and morph prices can easily absorb the costs of that. Someone whose ONLY interest is the bottom line should not be allowed to own animals at all, in my opinion.