Does anyone know HIS reasoning for keeping the list and the money?
I assume that he wanted the list to see who deserved favors based on how good they were to him but I really don't know why he would always have the exact amount at all times. That part makes little sense.
Thats just an italian thing with weddings, you keep a record of how much they gave you so later when their family has a wedding you go back to the record and if they were generous, you be generous back. But if they were cheap fucks, you be cheap with them. So its not really a mafia thing.