I oppose oppulence for Christian leaders. It sends the wrong message.
On the other hand, I have no problem with the pastor being appropriately supported based on the scope of the ministry involved.
As Marlowe says, if the pastor happens to be an author, lecturer, etc., there should be no less recognition that those fees, royalties, etc., are just as much his property as similar fees are the property of speakers or authors who are professionals in other endeavors.
If opulence among our leaders sends the wrong message then opulence among our congregants sends the same equally wrong message.
The scriptures are clear that we are to "esteem them very highly for their works sake". The office of Pastor is a gift to the church to prepare the members to do the work of the ministry. Why short change the gift? From experience, those that are constantly complaining about the Pastor's remuneration package are usually the ones trying to control the Pastor.