I work with (and for) bereaved people and have done so for over 20 years:
One of the most powerful drives for family (and often close friends) is to find out exactly what happened. When the person has died a long way from home they often find it imperative to learn the details. If the body cannot be recovered (for any reason) these feelings are often heightened.
Sometimes family will wish to see the most lurid photographs from the scene of a murder, they will even view the body when it is mangled and partly decomposed.
The reasons are manifold but my guess is that money is the least of them. Never underestimate the need for a family to learn what has happened and bring the deceased 'home'. I could give many examples from my direct experience.
If you want another direct example - consider the lengths to which the families of PanAm 103 continue to seek the truth. They know that al-Megrahi was the fall guy, the family know all the forensic evidence and yet they want to know who did it more than 26 years afterwards.