Gun collection goes to pay settlement. Gun owner takes dirt nap. Kids not interested in guns, so they go on sale. Owner loses interest in shooting. Owner trades rifle to get something gun writer wrote about.
Owner gets into financial trouble.
Guns go to raise money. Owner moves to new locale where guns are not welcome. Has to get rid of guns before moving. However, there are also some lemons among them. The first rule is buy only from dealers who will back what they sell you, or from individuals whom you know and trust.