I hope every prize in those casinos gets sold somewhere in-game, but it's not a big lose i suppose, like The Indomitable says, the only way to get them was to buy coins, it was time consuming to play until you get all these coins!
It was nostalgia of the first gen (RBY) the only reason i loved these casinos, but i don't use them anymore since then (when it was new and well, curiosity).
Edit: Personally, banning games and entertainment even in some small details is something i wouldn't expect from developed nations, i still don't understand some bans not only about the slots, but gaming overall (looking at you Aus).