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the castle/manor is nice and has had some good events with bitcoiners, while illiquid it does provide some level of enjoyment from its utilization. unlike say owning some altcoin which is illiquid but also useless.
It's not so much real estate being illiquid, but properties like "the castle" (a huge derelict building in the middle of nowhere) being illiquid. It's a white elephant, and requires a very specific and rare buyer. It's sort of like trying to sell an old 707 - a spectacular thing, would cost billions to reproduce, but good luck finding a buyer.