I considered your point at length. To address your comment, I could use the ignorance hypothesis on my old model, assigning equal probability values to everything between 1.7 and 4.0. Discrete if need be. I could use a binary output value as "enjoying the party," 1 or 0. I could do lots of other tweaks.

But the problem here is, everything comes down to whether this model (or any other 5-minute model) is good enough to explain my non-rationalist gut feeling, especially without an experiment. And, you know, I'm not about to fail an easy exam in a couple of days just to see what my utility function would do.