If cadence is not important whatsoever, why do they make cadence Training DVD's. (If its on the Internet it MUST be true)

http://www.performancebike.com/bikes..._400007_400017


Ok, I suggest we stop flaming each other and get back ON topic.

Cadence gives me an idea on what I am doing in a ride. I rode a while without cadence, ofcourse you have an idea on how fast ur peddling, but I cant feel the difference between 90 and 95 rpm. While in practice I can ride faster if I keep my cadence around 95-100, compared to 90-95