The most expensive succulent variety is typically the rarest and most sought-after. One of the most expensive succulents is the Pachyphytum oviferum, also known as the "Moon Valley" or "Moon Valley Egg Plant." This variety is highly prized for its unique, egg-shaped leaves and its limited availability. According to a report by the American Succulent Society, the average price for a Pachyphytum oviferum can range from $50 to $100 per plant, depending on its size and condition. The rarity of this plant, combined with its striking appearance and the difficulty in cultivation, contributes to its high price. Additionally, the demand for rare and unique succulents has been increasing, driving up their prices in the market.