Not just greed.
Many are deluded, & others suffer from aversion.
One Example:
Many who make offerings, will almost always offer to a Monk, over one who is destitute.
The belief is that if you make merit to a Monk, it has greater kharmic value.
Greed, as they are seeking to maximise the value of kharma.
Aversion, as they fear the results of poor kharma
Delusion, as their actions are based on custom rather than reality.
One thing that needs to be said.
Suffering from Greed, Aversion, & Delusion is universal.
Having said that, afflictions can be shaped by culture and tradition.