Why do stamp collectors refer to the stamps of some countries as wall paper?
All governments have realized that selling postage stamps to collectors is a great thing. It cost them almost nothing to print a stamp. They sell a copy to a collector for face value, and they don’t have to do any other work. There are a number of countries that realized that this was a fast way to make money and that some stamp collectors are gullible. They printed hundreds of thousands of stamps with images of famous movie stars, cartoon characters and other popular items to make a lot of money. They were never intended for use as legitimate postage.