Why is csgo Harp Warfare (Holography) so expensive?

Rare and in great demand. Out-of-print means that this collection can't be completely obtained from the game CS:GO, and things are rare and expensive. However, the csgo harp war (hologram) has become very expensive because of its small quantity and large demand. CS: GO is a new work based on 1999 "Counterattack", which is developed on the basis of team competitive game mode. The game divides players into two teams, CT and T camps, and each team must fight for multiple rounds on a map. The way to win the round is to achieve the goal required by the map, or completely destroy the enemy players.