Just as an FYI - King Kong is playing in over 3000 theaters, while Brokeback is still in limited release, showing in slightly over 600 (and it was fewer than that before last weekend.) Box office is not just measured in total dollars at any one given moment. You have to analyze the numbers of theaters, and other data. But it would be the rare art film that would gross more than a big thriller like King Kong. It does happen, though. Little films can take off, films like The Full Monty, which for one reason or another capture the public's attention.
It is in a few theatres to pump up the $$$ per seat average. If it was a hit it would have expanded by now.
if they want to be picky, year-old Polar Express did more per theatre last week than Brokeback Mountain....
BBM 13,599 per theatre (217 theatres)
PE 20,837 per theatre (66)
I am guessing that is the IMAX version of PE