What is the most expensive thing in the metaverse?

Can you tell me, what exactly is considered to be the most expensive item within the vast and ever-evolving world of the metaverse? Is it a rare digital artwork that's been snapped up for millions in cryptocurrency? Or perhaps it's a virtual real estate property in a highly sought-after neighborhood? As the boundaries of the digital frontier continue to expand, I'm curious to know what stands as the pinnacle of value and exclusivity in this digital realm.