Doubt, I can explain.
Gun collections are often times used for hunting, and when one buys a gun its usually for protections. Things like medieval weapons have no such purpose, after all in this modern erra such weapons and armor are impractical. Swords just look cool, plus they harken back to a time when people had to have skill to kill each other. Not just pull a trigger or push a button from 1000 miles away. But mostly because they are damn cool.