I think there's a world of difference between labeling something after it has been proven versus labeling something without having any kind of explanation as to what it is. For years now there hasn't been anything in the way of breeding trials, just people selling "blue motleys." That doesn't prove they exist.
It's hard to accept a new morph as proven when the only evidence consists of reports that go something like, "I heard that this one guy crossed like this one snake to this other snake one time, and I think he said he got like one of those hatchlings or something, but I'm not really sure." :santa:
If someone told you they had Green Ghosts, would you accept them as just that without any further information? If you asked them "what did you cross to make those" and they said "well, the parents are Green Ghosts from an unknown source," would that convince you?
It's all about predictability. If nobody knows whether or not something can be reproduced, or how it can be reproduced, there will be a lot of skeptical reactions. The same was true for Lava. Nobody wanted to accept it as new, even when Joe Pierce had reported the fact that he had outcrossed/recovered it just like a Mendelian recessive trait, and he had also crossed it to hypo and sunkissed to produce normals and prove it non-allelic.
With ultramel, there were something like 25 different crosses by August of 2004. Many still didn't believe it.
All in all, I think there is a very healthy skepticism in corn morphs. It causes a situation where something claimed as "new" actually has to be proven as new. I don't think that's a bad thing.