I am in no way qualified on this, but my assumption was that this comes from cultures that consider getting straight to business rude.
So while I do find it annoying, I also try to be polite back and I certainly won't be putting some "No Hello" link.
If it is a cultural thing and coming from a place of politeness, then I'll engage in a quick round of pleasantries. Once people are familiar, I've noticed this stops.