> $7 for a movie? Worth more than $7 in entertainment to the person buying it... or they wouldn't buy it.

What if the movie sucked but the person didn't know it beforehand?

> You don't get to be a millionaire by making people miserable.

Why not? I can think of several ways. You could make them miserable first by advertising, them sell your product as a remedy. Or sell a positional good and let your customers have bidding wars, even though the total sum of misery remains unchanged. Or sell a good with large negative externalities.