That might certainly be one factor, but my intuition is that the primary driver is still todays diet. Things like soda drinks that let you consume teaspoons of pure sugar in an instant without appropriate feedback simply didn’t exist in the past.

This actually is a hard question. I assume it needs to be an industry that is small, doesn’t have huge margins and probably is primarily manual labour.

Maybe something like blacksmithing?

At that length it seems more aimed towards business trips rather than tourists.