Oud is so expensive because it's known to be one of the rarest and most sought-after ingredients for perfumes. Not only does it leave a potent, mysterious, and above all arousing scent on your skin, but it can be incredibly stimulating due to its antibacterial properties, too - making even celebrities want these skin-enhancing perfumes and colognes like this top designer brand. The holy grail among Ouds is Taif or fragrant agarwood (AKA Aloeswood), which grows mostly in Muslim Southeast Asia, namely Malaysia, because of the country's climate. The demand for Taif has unfortunately driven suppliers to cut down trees over time despite their rarity and outrageously high price tags. As a result, certain other types of Oud have been introduced into the market, which, although they won't set you back by as much money, may suffice when considering substitutes during cheaper times.