Great thread. But you’re right, when the majority of these names say they are not for sale, they most likely are. They are just waiting for an offer they can’t refuse.
It reminds me of my childhood and watching WWE (WWF) back then. A wrestler had a slogan of “Everybody’s got a price for the million dollar man”!
I do find some of content/language people use hilarious though. Especially the first one (Gilbert). I can’t figure out whether it's half a joke and they're trying to be funny, or if they seriously think it's an effective choice of words to convince people it isn't really for sale. I guess it is at least getting some extra attention because of it.
I think it would be more convincing to just say "Domain is not for sale", "Under Construction" or simply nothing at all.