To be fair, if they sold it for USD, they'd have $68k USD but inflation would devalue those dollars as well. And that's a guarantee and not speculation and not variable over a specific 12-day window. Because if that person sold that car in bitcoin in a different window, those numbers may have reversed and they'd have a big gain. Which just goes to your speculation zone statement.If someone sold a car with bitcoin for $68k 12 days ago they would have $57k today. Our economy has pulled into ultra speculation zone