In a brief, impromptu video interview with Apple CEO Steve Jobs, captured and posted online by AllThingsD’s Kara Swisher, Walt Mossberg of the Wall Street Journal had the chance to ask several questions about the iBookstore and the iPad in general. When asked why someone would purchase a book from the iBookstore for $14.99 instead of paying only $9.99 on the Amazon Kindle or Barnes & Noble Nook, Jobs replied that “won’t be the…