What is the use of the commemorative stamp album issued by Postal Savings every year?

First of all, I would like to correct one of your mistakes. Postal Savings does not issue stamp albums. Stamp albums are sold by the philatelic sales department of the China Post Bureau. Now the postal savings bank is a bank, not the postal service. The annual album of stamps issued annually is for collection by philatelic enthusiasts, and this is its main purpose. Of course, now there is another function, which is a tool for China Post to deceive stamp collectors and make money. The main purpose of stamps issued in the past was to mail letters, but the main function of current stamps is to let you buy the set at face value or higher. Losing a lot of money in the sale is like buying a lot of fake coins. It seems that there is a face value on it, but the face value cannot be used. It is just a decorative pattern. In fact, it is just a picture with the face value printed on it.