What is the value of a pendulous scrotum?

Scrotal morphology: When body or ambient temperature is high, the scrotal muscles relax and allow the testes to distance from the body to keep optimal temperature for spermatogenesis. In colder conditions the muscles and scrotal skin tighten, bringing the testicles closer to the warm body. Otherwise, some men have more scrotal skin (pendulous), and others have less (tight), without specific benefit.

I'm not sure: there is any inherent value to the scrotum being more or less pendulous, it is likely that there is simply a range of normal. However, the scrotum contracts and relaxes in response to temperature in an attempt to maintain optimal conditions for sperm development.