4 pages? Really?
A split-game on Pinnacle is -104/-104 and has a probability of 50/50. Therefore the true odds are 100/100 and whichever side you pick, you're laying 4 cents of juice. Therefore, both sides pay the vig.
If you want to classify it as winners and losers... bookies use the losers' money to payout the winners. In a sample of 100 people with split-action, the 50 people who won gained their $100 from the losers' portion less the $4 which goes to the bookie.
Side A: 50 x 104 = 5200
Side B: 50 x 104 = 5200
One side is getting returned to the winner completely so no vig is taken there... We'll say Side A won so their initial investment is returned.
That leaves us with:
Side B: 50 x 104 = 5200
We still owe 5000 to Side A bettors so we use this money lost on Side B to take care of that and the bookie is left with $200 of Side B's money.
Seems pretty clear to me the money came from the losers; but overall, both sides pay the vig!
I agree with this, essentially a portion of the losers money pays the bookie and a portion goes to the winner, while the winner pays a portion back to the bookie out of his winnings. They both pay the vig.