I believe temperament depends on the individual snake. One of my males is incredibly shy and does not seem too fond of being handled, tries to slither away as soon as he sees the opportunity. While my other male is more relaxed, but is also the only one who has hissed, struck at, and bit me on multiple occasions. My female is calm, gentle, and is the only one I allow kids to touch.
As for why females are in high demand.. that is mainly due to the high interest in breeding throughout the community. Most breeders tend to sell of a lot of males but hold on to the females each year because one male can be bred to multiple females. Therefore, there are much fewer females on the market, resulting in them being more expensive. If you just want a pet, go for a male.You can find many breeders who sell normal males for $25-40.