@Mr.StickBall
It's interesting, because I'd compare Avatar and Gone With the Wind's adjusted grosses like I would Wilt Chamerlain and Kobe Bryant's best scoring NBA games.
I mean, Wilt scored 100 points in one game. 100 points! But the NBA had never seen a player like him before, and he dominated the the game because of it (Just like how GWtW dominated the movie industry during its time). Since then the NBA has grown and become much more competitive, just like the movie industry now-a-days. Sure, no one has reached that 100 point milestone since (and I doubt that we'll ever see it again), but Kobe scoring 81 points in this day in age is simply incredible. Comparatively, Avatar will never reach GWtW's adjusted gross (and as with Wilt's record, I doubt we'll ever see any movie reach it's adjusted gross), but for it to be having these sales in this day in age cannot be ignored and should be congratulated.