Random Surfer: Not every human male or female is of the right mindset to live on Gor. The Priest-Kings, and later the Kurii, specifically select individuals who are genetically predisposed to that sort of life. Their children, naturally, are also of the same nature.
We never see an old slave girl. They supposedly have anti-aging treatments that prolong human life for centuries if not indefinitely. So, their looks might not fade for a long time. Of course, they're instead stuck in a life where they're used as human sex toys for multiple human lifetimes with little chance for freedom and the ever present fear of death by capricious jerks and likely conditioned to enjoy that sort of life, which is probably even more horrifying.
Curiosity and emotional control are stamped out of slaves, and they're also forcibly given birth control. So in essence, being a slavegirl is a form of physical and mental Creative Sterility. Against all of this, there is the Gorean concept that when the right master and slave girl end up together, they will both be fully satisfied with the relationship - and have many centuries to enjoy it. This is the denouement of Captive of Gor, Slave Girl of Gor, and the other girl-protagonist stories, and a number of other master/slave relationships seem to be heading that way in other books too. Essentially, true can only be found by putting the right master with the right brainwashed sex-slave, who's clearly in a position to decide what she finds "fulfilling."
Fans seem to claim that more then 90 percent of women on Gor are free, yet we rarely run into a free woman in the novels who does not end up enslaved. We are told that every time a city state loses a war, thirty percent of the women are enslaved. We are told that any time a free woman exhibits slave-like qualities she is enslaved, and these qualities include wanting to be with a man, and doing the "slave dance" (i.e. reaching orgasm). We are told that any woman who accidentally lets her veil slip and reveals her face is enslaved (because subconsciously she wants to be a slave). There are streets full of paga taverns, each with anywhere from a dozen to a hundred slave girls. In every book we are introduced to tons of slave girls, at least as many as male characters. We are told slave girls are afraid of free women who are so desperately unhappy, they are cruel to slave girls because they are jealous (which makes sense, because free women can not leave their home, and hide their bodies and face so that they don't end up enslaved). None of this adds up to the idea that the majority of women on Gor are free. It gets even worse in Hunters with the reveal that most common domestic chores are performed by female slaves, with cities having large stables that can be rented out cheaply.
A meta example, but many people are disturbed to learn that John Norman's day job is as an ethics professor.
In the first book, one gold coin is worth five female slaves, yet later books have slaves being purchased for twelve or fifteen of the same coins, with nine being a remarkable bargain. Early-Installment Weirdness, or does the price vary that much?
It probably does vary that much, as a highly trained and experienced dancer will be more expensive than a newly enslaved, untrained girl. Slaves are considered livestock, and prices for livestock can be wildly different; eg, an Olympic show jumper will cost hundreds of thousands - if not millions - of dollars, while horses that haven't been trained for anything special can go for a mere $1000, or less. There's also the personal side of things; it's established in the books that many Gorean men will pay more than a slave's market value just because they want that particular slave.
