Clearly fun can be judged by the individual experiencing it to be EITHER more OR less valuable than the costs sunk to gain that particular experience, but other people's opinions may vary.

I’m not sure I understand the purpose of your clause, Brad. Why would (or should) others’ opinions matter to the actor? And if we’re speaking in eudaimonistic terms, as The Shadow did, does the units problem disappear? (That sort of thing is where I start to lose it in econ-oriented discussions.)

Jorge, since you agree with Brad, if you’d like to expand on your agreement, you’re invited to do so as well.