Hey, I'll take a stab at this one. (although I hate to bring this up, cause I'm just afraid of where it's gonna go) Since Pastels have a super form, the females are higher priced since they are in greater demand. You only need only pastel male to mate with lots of pastel females. But with spiders, males are more commonly used to breed to normal females and thus more in demand. Well there's my take on it.