What is so luscious about the identity of a sex worker is that it is perhaps the most diverse sexual and professional identity out there.
What it actually means, what the erotic (if it even is erotic) within sex work is, what being paid to do things is, what type of power dynamic it is is so unambiguous, perhaps simply because mainstream academia and media representations of sex work are so ludicrous. They are ludicrous particularly for a white, educated, middle class woman with a mind of her own, who is not too flustered by stigma doing escort work. They are, however, equally ludicrous for a black woman who voluntarily does street work during festivals. Equally, for an Asian migrant worker.
Categorizing it as antifeminist, objectification, oppression, violence, rape, immoral, dehumanizing actually gives that freedom...simply because it's so off. Similarly, categorizing it as another form of service labor, asexual, is equally off [or can be]...
And the money part--the fact that the incentive for sexual activity is something so universal--draws an incredibly diverse range of circumstances, sexual orientations, lifestyles, backgrouns for women (and men) into the industry.