And how do you figure out what the "average" power of a level 100 character is? Even level 20 characters vary widely. At level 100, you could have pretty much every optimized ability ever discovered compressed into one character, or conversely, you could be a straight Fighter 100, with Epic Toughness taken for every feat after 30th level, and all your money in a sword with a really massive bonus.
Not are those characters not on the same page as eachother, they're not even in the same book! Heck, they're in entirely different bookcases, located in separate buildings. So where's the baseline?