Elgin Marbles Poll

[Praefectusclassis]

duplicates are easily made and could be displayed 'in situ'

Duplicates in general have the added advantage that they can be made less fragile and as they're duplicates to begin with, can be displayed wherever so that people can study them up close. In the case of the Elgin marbles - and many other items like it - that would seem to be a huge advantage over gawking at them several meters away in their original location!