Good morning, CoSo!
Throughout history, the rich, famous, and powerful have eased, as they thought, the pain of their passing by placing an accumulated hoard of their wealth in their tombs. This seems to reflect any of several disturbing thoughts: that by burial, one's goods can go along to be enjoyed in the afterlife; that one's possessions are an inalienable part of oneself, and so must be buried to keep one's identity intact; or that one's successors must be kept from enjoying one's wealth.
@DavidSalo Some peoples have seen it differently.
In Balinese tradition the corpse is buried in a simple shroud for a few years, then exhumed and burned with costly ceremony in an elaborate sarcophagus. The ashes are dumped into the sea. The idea is to cleanse the soul of worldly taints (including possessions) so it may ascend more easily to the next world.
Similarly, many California Indian tribes customarily burned the deceased's house and possessions, to encourage the ghost to move on.