Come on, this is the same kind of irrelevant point that an anti-cryonicist would cleverly think up, rather than actually considering their actual preferences like they do when they're trying to get the best deals on amazon.com.

The people who preferred a white iPhone 4 waited an extra month to get it.

If a couples has had two boys, and now prefers a girl, then why mess around with Y-type sperm at all? It's because society says you're not allowed to use the "help yourself to what you want" pattern when the domain of your utility function is too biological.

Conflict between utility function maximization and cognitive conformity = rationality litmus test.