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by fastball 196 days ago
They're not free because they consume your time, which is valuable.
1 comments

Yes, but only if you would spend that time on something that is more valuable (according to your happiness+ heuristic).
Right, but I think that was the author's point: many of these activities are seen by their participants as "productive", rather than just "this makes me happy". That was a specific point of the post.