Despite what most all of us say, that the way the game runs, is more important than benchmarks, I believe we still look at benchmarks to help influence us when we buy a new card.
Granted, a benchmark may/does not truly represent a game, but it also gives the manufacturers, if no one else somthing to look at in trying to improve the performance of there cards. Look what happened to nVidia when 3D Mark 03 came out. Not saying there cards are inferior, but they had very low scores compared to ATi, and they worked to improve there drivers and therefore give there cards better gameplay, (at least I guess, I don't own one now). But I also heard they made drivers just for 3D Mark 03, not really to improve game perfromance, but I think that's over and done with and ther new drivers are for gaming performance.
The logic of the two cars racing; If these were both put on a dynamometer, the one with the most horsepower and torque (read benchmark) would win, all other things being equal. But as in video cards, all other things are not equal, (I know, I used to do a lot of drag racing). Different games play differently, but usually higher benchmarks, tend to mean all games in general will have better gameplay.
Not being a true fanboy of either nVidia or ATi, I suppose when I get another card, if they are both $400, the benchmarks would have a lot to do with what I bought, especially if they were 500 or 1000 points different.
. If I could navigate though your benchmark site olefarte, I'm sure I could say it performs sweet as well 
