Being a collector is an affliction. A huge house given over to his collection while he relegates himself to the groundskeepers cottage. A lifetime acquiring money to grow the collection. I hope selling it gives him some peace.
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Worth noting that the £1.5 million valuation is in the ball park of what the building is worth on it's own.
I think the parent's point is that while the collecting itself can be very rewarding it's far from guaranteed anyone else will find value in the collection. It does feel a shame to dispose of such a piece of work, but the real value is likely more in the collector than the collection.