Gastronomy
The expensive, and often prohibitive, costs of breeding horses have caused it to become an intense subject of study. Why horses only breed when fed golden carrots are unknown, especially when other animals, such as the humble cow, requires only wheat. Many reasons have been offered, such as the stress and nutrients required to birth a baby foal means that horses will only breed when given extremely nutritious and soothing food, or that it's a defense mechanism to protect itself from unscrupulous breeders who force-feed tamed animals.
Though the specific tastes and preferences of the Players tend to vary region by region, one superfood remains a constant in every Player's palate. Players will ferry wheat through inhospitable plains, carry cows through the world's largest oceans, and hoard every bit of sugar they have just so they can have another taste of cake. Why this preference is so prevalent is unknown, however one cannot deny that it serves as a particularly tasty treat after a long night of mining and crafting.