A couple of readers wrote to ask us why we hadn’t published the iPad Buyers’ Guide + iPod/iPhone Book 5 as an ePub download for iBooks. Even though the answer seemed pretty obvious on this end, I wanted to post these shots to give readers a sense of what happens when someone outputs a 150-page PDF-format book or magazine as an ePub document. The result is between 220 to 328 “pages” long at the minimum font size depending…