Spiders are dominant. You need a spider to make a spider. There are no hets.
Pastels are co-dominant. You need a pastel to make a pastel or breed 2 pastels to make a super pastel. There are no hets.
Albinos are simple recessive. That means the normal looking offspring from an albino breeding will carry one half of the genetics to make and albino.
The percentage of hets means the chance they can produce an albino.
100% hets mean that there is a 100% change they carry the genetics to make an albino. People buy hets since they are cheaper than visuals and then raise them up and breed them. Statistically, you should end up with an albino.
Males are cheaper since you can breed on male to multiple females. You don't need many. Females are more expensive since they are needed to make combos and as a breeder.
They typically max at about 4 feet. Takes a few years to acheive full size. Breeding is weight related mainly. Males can breed at about 800 grams and females at 1500 grams. Males usually 1 1/2 years old and females at about 3 years old before they can breed. Older and larger animals make for the best breeders.