I was going through the themes this weekend and noticed the Joker card has a alternative card. When is this card displayed? I made it the default and changed the color of it.

The Joke.png is used with the iStripper product
the Joker_white.png is used with all the 3rd party white labeled products
Such as Playboy Strippers or Playboy Plus Strippers.

It's just the graphic image used to display a joker card that is in your Collection.

Playboy Strippers or Playboy Plus Strippers.

Whoah! Does Playboy actually have an app that's a white label version of yours? I can't find such a thing online, at least not easily.

My understanding is:
it was a partner venture that has since been discontinued.
but members that Installed the white labeled versions still have the app.
It is Identical software.
Only with different graphics applied.