If someone collect hummels I would think they may already have some and like you mentioned have had them for years. They’re probably just looking to by one or two to complete their theme or set. If the book value is $50k selling the entire collection as a set for $50k would be difficult. Also this is a hobby and few buyers will have that kind of cash to spend on a hobby. Especially if they are on, say a fixed income.

I think the only person who would buy them all would be someone who would split them up and sell them separately to make a profit. I would dump them on eBay one at a time. I think you would double your money that way.