There are many things you can buy for $10,000: A nose job. With luck, a used car. A middling ticket to the World Cup final. Or you could purchase a MacBook Pro. That’s how much the highest-end, fully loaded version of Apple’s laptop now costs—$3,000 more than it did last week. Maybe you don’t need the most powerful MacBook Pro. But last Thursday, Apple announced price hikes on most of its products...