This might not sound like a huge deal, but one of the big consistent things Vince McMahon has done over the years is buying up the tape libraries of just about any rival or defunct wrestling promotion you can imagine. At least US ones. So you aren't just getting the rights to WWE's massive well of their own content, it's basically buying the rights to decades of wrestling history to boot.

That plus the fact they have a lot of investment in things like their own film production arm, stuff like that...even if Star Wars is more popular than WWE today that doesn't always translate to being worth more as a whole bundle.