Avatar was only able to break this record because of the increased revenue from the 3-D ticket sales (12 bucks a ticket versus 8-9 bucks a ticket). With out that extra increase in price (Something I helped do too, I saw it in 3-D), it would not have broken that record.
True, but to be technical you would also have to factor in inflation to male everything fair. There are quite a few websites and they all say "Gone With The Wind." You make some good points