Thee are some very successful, unscriptural ministries run by wealthy televangelists who gain much of their wealth from poorly educated people. And these televangelists have something in common: self-promotion. The key to their success is teaching people how great the wealthy televangelists are.
As a result, churches are sometimes plagued by people who believe that they are authorized by God to glorify themselves by seizing control of ministries run by Godly people and taking all the credit. There might be exceptions, but in every case I know of, a person who seized a ministry that God gave to someone else ruined it. In every case in which the person held on to the ministry, it continued to succeed.
Jesus said that people who exalt themselves will be abased. It's hard to believe that when you look at the wealth and prestige of wealthy preachers, but their time is coming. And for their imitators in local churches, it often comes fairly quickly.