Filed under: Apple FinancialImmediately after the iPad's introduction, Piper Jaffray analyst Gene Munster predicted that the iPad would have a minimal effect on sales of the Mac. "The gadget is a premium mobile device, not a computer," Munster said. "Consumers looking for an affordable portable computer will likely stick with the MacBook lineup." The latest NPD data has proven Munster's prediction correct. US Mac sales were up 39 percent year-over