Agreed. One of the interesting points in that Dawkin's book is how sexual selection can result in the enhancement of traits that neither increase survivability or produce more offspring. He talks about 'fashions' spreading within a species, in his personal theory of how humans started walking upright.

Basically, the females or the males start selecting for a particular rare behavior as indicative of something desirable over their lessers, which leads to that male or female exhibiting that trait reproducing and the trait being reinforced for as long as it is in 'fashion'. Several cases of the way that can run away are presented in the book; Testicle size in chimpanzees due to sperm competition and the incredible sexual dimorphism in elephant seals which has driven the male to up to 8 times the size of the female. (Only one male in any given group reproduces.)

There's always a reason for any selection, but when you deal with creatures with any kind of mindfulness, sometimes the reasons stem from the minds rather than perfectly from the biology.