The owners have the mentality that more is better but when there are dozens and hundreds of items, the mass of items are just that: a mass!
This is a marvelous example of how to showcase a collection: with restraint, with space and with drama.
With collections, less is MORE because each piece can be seen clearly and fully appreciated. If you have a huge collection, put most of it away and showcase a minimum. Every few months, pull out some of the other items and showcase them on a rotating basis.