I was under the impression that reducing the weight of your wheels is important. However, I'm noticing that many of the extremely high-end aerodynamic rims are actually heavier than cheaper rims by the same manufacturer.

For example:

* Easton's relatively entry-level [EA90 SLX wheels](http://www.eastoncycling.com/product/ea90-slx/) clock in at 1398 grams and around $1000 for a pair, while their super high-end [EC90 TKO](http://www.bikewheelsets.com/reviews/easton/easton-ec90-tko-wheelset-review/) are 1545 grams for twice the price.
* Mavic's [Kysrium Elite S](http://www.mavic.ca/wheels-road-triathlon-ksyrium-elite-s#.U_DFpPldV8E) wheels are 1520g and less than *a third* the price of their high-end [Cosmic Carbone 80](http://www.mavic.com/wheels-road-triathlon-cosmic-cxr-80-t#.U_DFtPldV8E) wheels at 1640g.
* Zipp's [30 Clincher](http://www.zipp.com/wheels/30-clincher/#) cost only $850 for a pair at 1655g while their [808 Firecrest® Carbon Clinchers](http://www.zipp.com/wheels/808-firecrest---carbon-clincher/#) cost $3000 and weigh 1730g.

Obviously the prices seem to support the idea that aerodynamics matter more than a few hundred grams of weight, but at what point does the added weight offset the gain? Or is the importance of reducing [rotational weight overstated](http://en.wikipedia.org/wiki/Bicycle_performance#Advantages_of_light_wheels)?