What is the most expensive thing in Adopt Me?

In the popular virtual world of "Adopt Me!", I'm curious to know what stands as the ultimate symbol of luxury and extravagance. What is the most expensive item that players can aspire to own? Whether it's a rare pet, an elaborate decoration, or a unique accessory, I'm eager to find out what truly commands the highest price tag in this vibrant community. With so many options and features, it's intriguing to delve into what truly sets the bar for luxury in "Adopt Me!".