most expensive item you ever sold? how much did you earn?

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I was looking for a discussion about purchase of expensive item, but the only thing I found was a discussion about the most expensive purchase anyone has made. I heard of this business concept, of helping people (but getting paid for helping them) sell expensive items (like old cars, expensive watches, yachts, even houses, etc). So what's the most expensive thing you've ever sold? (I personally have only made purchases, I've never sold anything online.) How much did you earn in the process?