For the museum, it’s a way to sell more books by having different price levels. The visitor gets a chance to personalize their book and get one at the price level they want to spend (not necessarily cheaper.)
Every time the visitor sees an exhibit they would like in their book, they select it (using an app, a special device they get when they enter, etc.) When they finish with the exhibition, they choose the type of book they want (how many pages, size, the amount of text, level of production quality, etc.) and after a short time they can pick it up at the museum shop printed especially for them just the way they wanted.
For card lovers, manufacturers, historians, and collectors.
A website cataloging all playing card designs know to man. From the distant past to the latest ones. People can also submit their designs and manufacturers can find new designs among these.