Because wealth comes from the Almighty the Almighty, it will return to Him, in their own ways.
There is a God who hurts and spends his property for medicine, some are 'taken' by others, some are gone through calamity, some are spent on coffee tables and gambling tables, some are used up for extreme hobbies, some are taken by the KPK , there is a run-off in the election season because of the follow-up of legislative candidates, and for those who are in conflict, are spent by grandchildren.
Likewise some others, there are those who run out by building homes of poor people, empowering the poor, sending orphans to school, helping sick people, contributing to places of worship, building education places, empowering relatives, helping those who are more unfortunate and needy, etc.
In essence, a person's wealth will run out in time. Some spend in the way that Allah is not happy and is in the way that Allah has recommended.
The question is, what way do we "return" the treasure that God entrusted? God gives prerogative rights to His servants to endeavor and make their choices.
This is the way I read it..if you have different views, feel free to share.