Dark Knight is basically a lock to surpass Spider-Man and become #1.
Already has.
You can't count inflation. If you count inflation with box office intake, you must count inflation with salaries, production budget, gas prices, food prices, et cetera.
I think that's silly economically. In every other industry, and for every other reliable index or measure we want to use for anything important, we
always adjust for inflation. Numbers become meaningless otherwise.
You wouldn't need to adjust for inflation of salaries, production budget, gas prices, etc., because all of that is built in to ticket prices; markets embed inflation expectations. Likewise, you don't need to account for income growth or anything like that, because wage growth is built in to normal measures of inflation. $3 million when the average person earned $10/day is obviously not the same $3 million that
The Dark Knight made on Tuesday. To use an example, it makes little sense to say that artist salaries have increased by (for instance) 1000% in the last two decades than it does to index that number against inflation, and the same is true for box office numbers. And it might make even more sense not to index artist salaries against inflation, but against the size of the industry, since any increases in nominal salaries will be exaggerated by any industry-growth that exceeds the economy as a whole.
But I digress.
You can't even count based on ticket sales, as habits of people change towards motion pictures over the years.
I think you just have to accept that people's habits change. Realistically, there are only so many things we can adjust for. The purchasing power of the film's gross, the
actual value of what it took in, seems like a reasonable thing to adjust for. Ticket sales don't reflect as much information, IMO, because they don't convey how much people were willing to pay to see the film.
Most measures use ticket price inflation specifically, but I disagree with that. With varying ticket prices, using actual inflation makes more sense to me; then you've got easily accessible measures of how many people saw the movie and how much people were willing to pay, relative to the purchasing power of their money at that time, to see any movie. That's why I don't feel ticket sales mean much.
You've got to just count it as it is. TDK has made the most of any comic book or superhero film. Period.
It looks like it'll get there either way, and this isn't really an important issue. I'm probably one of the few people this matters to.