Microsoft has posted a new Zune advertisement to YouTube, comparing the cost of the company’s Zune Pass subscription service to iTunes. Starring “Certified Financial Planner” Wes Moss, the ad goes on to suggest that it costs $30,000 to fill an iPod—with a black iPod classic shown as an example—while it costs only $15 a month to fill a Zune using the Zune Pass service. As the latest attempt by Microsoft to erode public…