Fenrir, I'm impressed by your knowledge. I'm Indian so yes, this happens. It is believed that if an Aravani person curses you, it is not good. They use this superstition to their advantage and sometimes accost and intimidate pedestrians for money. I once got punched by an ARavani because I did not give her money. Most are really sweet though.
I know of a film director who sent them to an ad agency that had not paid him. The Aravani clapped and sang and sang till the agency people were so fedup they wrote the check. Of course the Aravani got a percentage.
You know because of their appearance and superstitions, few will hire them for jobs (and India and Pakistan dont have an anti discrimiation law) so if they are making money like this, they take the opportunity.
To my Indian Government's credit, some politicans are Aravani. They get a chance to be legislators. And the aravani are doing a fabulous job educating people about AIDS and HIV.