The California State Athletic Commission has released the payroll and gate information for UFC 104:

Lyoto Machida $200,000 (no win bonus) def. Mauricio "Shogun" Rua $155,000
Cain Velasquez $70,000 (includes $35,000 win bonus) def. Ben Rothwell $50,000
Gleison Tibau $38,000 (includes $19,000 win bonus) def. Josh Neer $14,000
Joe Stevenson $94,000 (includes $47,000 win bonus) def. Spencer Fisher $26,000
Anthony Johnson $30,000 (includes $15,000 win bonus)* def. Yoshiyuki Yoshida $12,000
*Johnson forfeited 20-percent of his $15,000 show money to Yoshida for missing weight
Ryan Bader $30,000 (includes $15,000 win bonus) def. Eric Schafer $13,000
Pat Barry $134,000 (includes $7,000 win, $60,000 Knock Out of the Night and $60,000 Fight of the Night bonus) def. Antoni Hardonk $76,000 (includes $60,000 Fight of the Night Bonus)
*Barry earned added $60,000 bonuses for Fight and Knockout of the Night
Hardonk earned an added $60,000 bonus for Fight of the Night
Chael Sonnen $54,000 (includes $27,000 win bonus) def. Yushin Okami $18,000
Jorge Rivera $36,000 (includes $18,000 win bonus) def. Rob Kimmons $9,000
Kyle Kingsbury $16,000 (includes $8,000 win bonus) def. Razak Al-Hassan $3,000
Stefan Struve $74,000 (includes $7,000 win and $60,000 Submission of the Night  bonus) def. Chase Gormley $10,000

The official attendance at the Staples Center was 14,892 with gross receipts of $1,913,093.62 and a net gate of $1,762,549.

The only real X factor out thereabout how much the UFC profited off this event is whether or not champion Lyoto Machida got a % of the PPV buy. But that comes out of the PPV receipts anyway. Even with a relatively poorly selling event, the UFC is likely in the black from gate receipts plus the money made at the concession and souvenir stands.

Per MMA Payout, the SPIKE TV airing of two preliminary fights drew 1.4 milliion viewers for 1.1 rating. MMA Payout also projects a PPV buy number of 398,000. This would be down slightly from UFC 103's surprisingly strong number. Payout's projection method is untested so just consider it an informed speculation until we get better numbers.

Regardless, the moral of the story is the same, the UFC continues to thrive in very tough economic times, even with a less than ideal headliner in their formerly marquee division.