Made, marketed, and sold as 'collectables' typically by private companies**. They normally do not have much, if any market value. You can check 'sold' eBay
listings to get a feel for their market value.
That said, I know of one collector who has made an US album full of them, and frankly it looks pretty cool. He said that this album gets far more praise and attention from non-collectors than any of his high-end US collections.
**It is often said that anything marketed as 'collectables' are never really collectable.