It's not fixed, everyone knows that the company decide who is winning. The only say the fighters get is on the match itself. Salry wise, there were some leaked earlier this year.
Vince McMahon - $1,184,500 for 2014
Triple H - $1,550,000 for VP of live events and talent, plus in ring salary of $2,120,000 for 2014
The Rock - $3,500,000 plus 7% bonus for high merchandise sales
John Cena - $2,750,000 plus 7% high merchandise sales and a share of PPV revenue
Brock Lesnar - $2,000,000 plus 3.25% high merchandise sales, free travel and PPV revenue share
Undertaker - $2,250,000 plus 7% merchandise sales, travel & accomodation, PPV revenue share if a main event
Compare those selected few to the Divas though.
Nikki Bella - $112,500 plus first class travel
AJ - $104,300
Paige - $65,500
The full list of leaked salaries can be found here:
http://www.totalsportek.com/money/ww...lers-salaries/