I would suggest taking a second look. I know some really humble black preachers. I am not a priest, but if I had to defend what you see, I would suggest:
Nice cloths attract other people. You want to have a nice congregation where people see you as the leader, then one may think that the nice expensive cloths will encourage the congregation to believe God is generous. ok that is a stretch, but I am trying:)
The big car is to aid the congregation with transportation, you konw taking the elderly home, and making sure they are comfortable.
The big home is for the nice Sunday dinner after church where the congregation and the family have personal time with thier leader. (That is possible).
Who knows except the individual. I know there are some charlatans, but if they knew the real rules about leadership and religion, they woudl know that they will have a not so pleasant fate in the end.
I hope this helps.