That’s an interesting question. The most expensive thing ever sold at auction depends on the category. For example, the most expensive movie prop ever sold at auction was Robby the Robot from the 1956 film Forbidden Planet, which sold for $5.375 million in 2017.

 The most expensive sculpture ever sold at auction was L'homme au doigt by Alberto Giacometti, which sold for $141.3 million in 2015.

 The most expensive artwork ever sold at auction was Salvator Mundi, attributed to Leonardo da Vinci, which sold for $450.3 million in 2017.

 However, some experts doubt the authenticity of the painting and its attribution to Leonardo. The most expensive item ever sold on eBay was a yacht named the Gigayacht, which sold for $168 million in 2006.
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