While HBO has roughly 10 million more viewers than Showtime, CBS has nearly 100 million more viewers than HBO. Apparently, a Pacquiao-Mosley buildup will air on CBS, which in itself is absolutely huge once you take into account how many homes CBS is able to reach. Also, I imagine there will be advertising for the PPV during other major sports on CBS. Showtime's PPV is capable of reaching just as many homes as HBO-PPV, so I don't think Top Rank is losing anything in this particular deal. If anything, they're gaining the ability to advertise their PPV in more homes than they have in a very, very long time.
In 2008, they had 98 million viewers according to this article... http://www.usatoday.com/sports/college/football/2008-11-17-bcs-fox-espn_N.htm Not sure if that number has increased or decreased since. But I do know HBO has been losing subscribers in recent years while Showtime's numbers have been increasing.
HBO's hard a hard time replacing massively successful shows like the Sopranos while Showtime has a pretty solid core of popular shows that keep getting them more subscribers.
The author missed the part that for Tyson's biggest fight, Lewis, King had to work with HBO again. Tyson fought a bunch of bums at the end of his career on showtime, who cares.
Everyone that has cable has ESPN, pretty much. Its a 'basic cable' channel, comes with all the other ones. HBO and Showtime are add on special channels where you have to pay above regular cable to have them.