All physical audio formats are trying for the same success LP had with the 'vinyl revival'. More than just a flash in the pan, the return of vinyl has proved to have true staying power, and has long since outlived the hipster trend that sparked LP's 21st century reboot. We have seen the return of compact cassette at one extreme, and the rebirth of the open-reel professional tape machine at the other. And we've even seen some recent uptick in sales of CD. Physical formats, it seems, aren't going away just yet. But why are they still popular? Someone buying a CD is spending more on a digital file than they would spend streaming a more high-resolution online counterpart....