All terms were invented by somebody, so that in itself is not a problem. I was once criticized (on another forum) for inventing the name "Nullist" for someone who has an empty belief (about anything), like a rock or a new born baby. In computing, there is such a thing as a NULL character. It occupies a space, but there is nothing in the space, not even a "blank". I like the concept and used it to make up the name Nullist. They said, that's not a proper name. You made that up ! However, I agree that the term "threshold of intolerable improbability" is not useful, except as a device for stimulating thought.