(emphasis mine) But that is precisely my point. Why are you excluding airline pyjamas from the list? What is the common sense logic behind it? Or why for that matter are you presumably excluding Y headsets which are also reusable?

And while this is only a guess on my part, I would tend to intuitively disagree that hotel pens are a borderline case if we go by majority balance and suspect that the vast majority of people who stay in hotels would consider that it is actually acceptable to take the pens hotels leave in their room. By contrast, I suspect that airline blankets or crockery would likely split opinion more.