Affiliate Marketing Secrets

I don’t get how Boxers get paid 15M+ for fights and top MMA fighters never break 500k. At the last UFC event according to this link:
http://mmajunkie.com/news/21951/ufc-125-salaries-thiago-silva-and-frankie-edgar-top-872k-fighter-payroll.mma
The main event fighter (Who is a Belt holder) only made 102k, and that’s including his win bonus too.
At first I thought maybe way more people go to Boxing live events and they fill 100k stadiums, but then I figured, the last UFC with GSP headlining had 23k and they still didn’t come close to a boxing payroll. Then I logically thought way more people must watch Boxing PPV’s, however at the GSP vs Koshcheck II post-fight press conference Dana White mention how the UFC is “In half a billion homes worldwide”.
So what is it exactly that allows Boxers to be paid so much more? I can’t imagine, even if it’s more popular than the UFC that it can be THAT much popular. For it to make sense in that way, they would have to be in 5 billion homes worldwide and selling out 800k stadiums, it’s just not logical.
So anyone know the secret to this advance boxing marketing?

to helen- edgar allen poe
Helen, thy beauty is to me
Like those Nicean barks of yore
That gently, o’er a perfumed sea,
The weary, way-worn wanderer bore
To his own native shore.
On desperate seas long wont to roam,
Thy hyacinth hair, thy classic face,
Thy Naiad airs have brought me home
To the glory that was Greece,
And the grandeur that was Rome.
Lo, in yon brilliant window-niche
How statue-like I see thee stand,
The agate lamp within thy hand,
Ah! Psyche, from the regions which
Are Holy Land!