San Diego, including Pure Platinum's formerly numerous locations, have always had a tip walk. When it's busy you might not notice because girls get snatched for VIP before they make it all the way around.
I "grew" up with this in strip clubs so had to learn this wasn't the norm when I started traveling the country and visiting strip clubs. Now that I travel extensively, I've learned that different areas have different traditions.
This also goes for how much you can touch. In San Diego, it is usually sit on your hands. The first time I got a dance in Tampa, the girl pointed out that I can touch her. Now my rule is if the girl grabs my junk, her junk is available too.