Blowing your life savings on a big party may bring a lot of short-term fun, it will probably bring long-term misery.

I dunno, Presto. I would agree if you said it could bring long-term misery—and I can certainly envision many scenarios where that would obtain. However, I can envision other possibility-scapes in which spending one’s money could bring even more fun to one’s life—say, for example, the self-made millionaire who now has a fresh opportunity to test himself against the market, to see if he can score another success.

Individuals certainly do things that they come to regret. But if they were pursuing eudaimonia, would there not be fewer regrets?