The corporations that hold these copyrights are media companies that also control most of the new media that comes out. Estimates vary, but it's said that 98 percent of all culture is unavailable right now because of copyrights. So the reason they hold the copyrights isn't because they want to get paid, it's because they don't want all the old stuff competing with the media stream that they control now.

"Frequently Asked Questions", sitasingstheblues.com. Retrieved 28 February 2013.