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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In general a collector gets joy from their collection, whilst a hoarder finds it distressing.
From the outside both might look similar, but from the article this person both seemed to enjoy it _and_ make a successful career from it.