Couple minor nitpicks:

Consider the difference between a hunter-gatherer, who cares about his hunting success and to become the new tribal chief

Not too many foragers have chiefs, unless they're living in such opulence that they can settle down (see the very wikipedia article you linked and comments about social structures).

If you already knew a movie, you wouldn’t watch it.

So why do people re-watch movies? Or watch movies to which they already know the spoiler or premise?