In terms of business mistakes that I've seen over a long lifetime, I would say that trying to minimize taxes too much is one of the great standard causes of really dumb mistakes…. Anytime somebody offers you a tax shelter from here on in life, my advice would be don't buy it.
As you can tell in Berkshire's operations, we are much more conservative. We borrow less, on more favorable terms. We're happier with less leverage. You could argue that we've been wrong, and that it's cost us a fortune, but that doesn't bother us. Missing out on some opportunity never bothers us. What's wrong with someone getting a little richer than you? It's crazy to worry about this.