The Socotranums name is derived from it's place of origin. The Island of "Socotra" off of Yemen. It is sometimes called "True Soco" only to not have people confuse with what the Thai people are growing called, "Thai Socotranums" a subsp of Arabicum.
Many have these plants and have had for 10yrs and better. The life span of a plant does not determine it's rarity or time in culitvation.