“Archaeologists searching for the lost bodies of doomed lovers Cleopatra and Mark Antony have made a number of important discoveries.”
Is it really the best use of time, money, and energy to find twom measely people? If you want to be whisked back to the romantic past, read Shakespeare.
Well, if you must have a purely practical reason to justify this research: Tourism is one of Egypt's biggest industries. The more cool things they have to show the tourists, the more money they generate. So in that sense alone it's well worth the effort.
However, some of us love the pursuit of knowledge for its own sake and require no such justifications.