Star Wars is very valuable, but I think you overestimate -- $4bil does not factor in the cost of making new movies, which is in the hundreds of millions.
Consider another way: had Disney not bought Star Wars, do you believe they could have built a franchise or franchises of a similar money-printing status for that $4bil? Pirates of the Caribbean have earned close to $4bil:
UFC is a running institution that other parties work to endure and build. Gyms find and train fighters (UFC does not need to participate in this). Those Gyms hype fighters and build fanbases that feed back in as a tributary to UFC. 8x rev for a quickly growing sport franchise that essentially 'owns' fighting outside of Boxing is not terribly high a valuation.
Consider another way: had Disney not bought Star Wars, do you believe they could have built a franchise or franchises of a similar money-printing status for that $4bil? Pirates of the Caribbean have earned close to $4bil:
http://www.boxofficemojo.com/franchises/chart/?id=piratesoft...
UFC is a running institution that other parties work to endure and build. Gyms find and train fighters (UFC does not need to participate in this). Those Gyms hype fighters and build fanbases that feed back in as a tributary to UFC. 8x rev for a quickly growing sport franchise that essentially 'owns' fighting outside of Boxing is not terribly high a valuation.