Or should I say brown sugga wuggas...pardon me for being an ignant millennial.  

You make a fair point, but we have no way of knowing the reason behind black women not being part of the PV scene. Perhaps there haven't been that many applications, or perhaps they don't want to hire blacks. Just like Asian agencies don't hire whites or hispanics..  

OK, I'm probably about to get flamed, but... several studies of online dating sites, and an article in the Economist analyzing the escort biz, all show that black women are considered the least attractive.  Online dating they get the fewest likes or hellos or asks by far, and they charge less as escorts, on average, meaning less demand.  PV not only attracts middle class providers, it attracts middle class customers who want clean college girls not pimped addicts or whatever.  So, either the PV agencies don't waste their time, or the girls don't last because they don't get enough trade.

And when I worked at BG years ago we had one AA girl there and other ladies of different ethnicities.

I know some real old school pimps and every woman who got them started or kept them afloat was a white woman .So I have some research of my own and True Caucasian, Hispanic and Asian women all charge more for time and hold more weight in the eyes of the hobby than Us African descent ladies...We get it, We know it and it has been thrown down OUR throats every chance Ya'll get to remind US.

Once again the concepts of MORE and ALL get confused.
I am only guessing the motivations of PV agencies.
But, there is no question that if one wishes to avoid Thugs, and one is not doing individual screening background checks, the simplest most effective way is to avoid black men in general.
Most effective, not fairest.
Black men are thugs at 8x the rate of all other men, over 10x the rate of white men.
Ask Obama's justice department.

I apologize for offending you.  But to answer directly, no they don't HAVE to.  No, they don't only.
Its not about Must, or All, or Only, or Always.  No absolutes.
Good people come in all races and sexes and ages, Bad people too.

digdirkler its better for people to think you're an idiot than open your mouth
and prove it where do you get your information from some movie you watched

source of information: the news, US Bureau of Prisons Statistics,  FBI Uniform Crime Reporting Statistics, Department of Justice,  US Centers for Disease Control, The Economist Magazine (study on the economics of prostitution), other articles about online dating and race.
Everyone is entitled to their own opinions, but not their own facts.