The city has grown from a small border town with a salacious reputation during the Prohibition Era in the United States into a large, modern city with a sizable middle class and ever expanding housing estates.
Tijuana's proximity to the United States, along with Rosarito, has made the two adjacent cities a very popular tourist destination, especially for day-trippers from San Diego.
The $10 is just basic intercourse, the girls then charge a la carte for extras (touching boobs, positions, etc.).
You're probably not going to take a cheap street hooker to dinner, so the street girls are mainly for those guys who want a quick sex and then get back to their own business.
Prostitution is legal in Mexico but pimping and soliciting on the street are not.
Cross this busy US-Mexico international border station and you may think you’ve crossed into the Wild West. Prostitution is legal (tolerated) in certain parts of Tijuana, Mexico.
Prostitution is legal in this zone and very visible.