Not only do I agree with all those points, another bare-bones reality for the other poster is that it doesn't matter one tiny bit how honestly a cross or hybrid is originally sold as, because just as soon as it leaves the vendors table, the majority of all their offspring, and their offspring, and THEIR offspring's offspring will be sold AND bred to as what they likely best represent,....simple as that!...this is the reality of the true dynamics of how the hobby ACTUALLY works, not how it would be liked to work.
I see this every single day now, and have for many years. And I'm not talking about only corns either....LOTS of kings, milks, ratsnakes, etc...
Now someone here ask me how many posts and ads I have seen over the years that proves exactly what I am saying here.....ANYONE!!
See, if nobody did this, it wouldn't be an issue anyway, but since many DO, it IS!..LOL!
Also, I love to hear all the same pseudo "justifications" they always use by always saying things like..."so what is really pure?", or "how do YOU know your snake is pure anyway?".
Or they say "many so-called "pure" snakes that are captured in the wild are intergrades to different degrees, so what's the difference if I make a bunch of mutt crosses to be dispersed into the hobby??, what's the difference?. So this in turn makes them feel better about doing it on absolute PURPOSE because there are already many questionable snakes out there, so what's wrong with perpetuating countless thousands more and muddying up the already brown water in the hobby?.
Yes, the one undisputable factor will ALWAYS be......because you KNOWINGLY bred two very different types on purpose, and for the offspring to go out and do the very same thing you just did!, well, many anyway, and the other portion are people that actually BUY these very same snakes "thinking" they are getting something else entirely.
Then, there are the people that would know an authentic subspecies of something if it bit them right on the nose, and THAT TOO is another reason they get created too. There is simply no end to it.....EVER!, and this snowball only gets much larger every single breeding year.
One last thought for everyone. Would you think that any cross you ever produced and dispersed into the hobby mainstream would ONLY ever be bred to the exact same genetic cross that the original animals consisted of?......of course not!, all those can never be taken back once they leave the table, so all their countless offspring end up for the most part being bred to whatever they "seem" to best represent.
This is what will never go away.
Oh, here's a little something else too. The term "pure" is a totally relative term anyway. I like to refer to different subspecies and their phenotypes as being "genuine", or "authentic" as this is much more accurate. Any animal that evolves over time, and has had ranges change over countless mellenia realy isn't something "pure" like a virgin chemical would be. Animals are naturally composites of genes that tend to eventually make up a basic standard phenotype in any given geographic area, hence the better term "genuine" or "authentic". Not necessarily pure by literal definition.
~Doug
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"a snake in the grass is a GOOD thing" 
my website -Serpentine Specialties