Zhuhai is right across from Hong Kong (next to Macao). It used to be a holiday resort place (now it also has industries) and so offers a lot of “entertainment” catered to men.
Girls from all over China come here to work in the sex industry for a couple of years, save up enough money, then g home and open a small business. As a result, you will only get young and fresh faces, not the older, tired looking ones.
Everything is a lot cheaper than Hong Kong across the bay. You get what you pay for, and in my experience (going there every month for 2 years now), there are no rip offs.