That's very good question.
I approach it by imagining if I arrived at the airport and was told that I would be given £1,000 to do what I wanted with when I arrived at my destination if I stayed in my economy seat or I wouldn't be paid if I moved to a slightly better seat for the journey. Each of us will have an idea which way we would go.
Also an interesting point about small children in premium cabins. If you can afford it then fair enough but I don' think they get a lot out of the extra expenditure.
YMMV.
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