Fear of God meaning a feeling of profound respect for someone or something? Or, an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)?
If a wealthy person doesn't revere the Lord God, it can be because they feel no need to give their respect to Him, or just don't believe the there is a God. They are successful, financially free and have others to do their bidding. Some have good morals and others have gained their wealth through craftiness and trickery.
Those that don't fear in terms of being scared of something and don't anticipate failure may be wealthy and powerful, because they don't have the spirit of fear.
There is nothing wrong with having wealth and power but it does make a difference on which kingdom is served, weather it be the kingdom of Christ or Babylon's kingdom. One is perishing and the other is blessed.