Timr is right in that a very high probability foreseeable event doesn't really count as a opportunity cost. I made clear to what specific point my original response was.

I expanded on my original analogy because Timr left me with the impression that he thought it wasn't an opportunity cost because it was a law (and that made it OK). Being a law isn't important. The predictability, when buying the property, is. My analogy also shows that even if the event is predictable, or as he would say, "the rules of the game", it doesn't mean it's just in any ways.

Here's a different analogy.

If you buy a farm land that gets flooded every single year on the last day of June (for the past 200 years, like clockwork), you can't really say you lost money when the next flood happens; you should already have factored this event in overall expenses... tho it still sucks that your land gets flooded.