Why is iris rare?

Could you elaborate on why iris, the digital currency, is considered to be rare? Is it due to a limited supply or a unique algorithm that makes mining and creation of new iris coins challenging? Additionally, are there any other factors that contribute to its scarcity, such as a high demand from investors or a specific use case that sets it apart from other cryptocurrencies? Understanding the reasons behind iris's rarity could provide valuable insights into its potential value and future prospects.