Many of the richest pastors made their riches on books, not salaries.
At the end of the day, this is still making money out of religion, and certainly is NOT the spirit in which the Lord Jesus and the apostles preached/taught the Gospel! Matt 10v6, Acts 3v6, 20v33, 2Cor 8v9.
Nowhere do I read in the Scriptures that the Lord Jesus, after He preached the Sermon on the Mount, that He wrote a book on it and sold it, or that Paul, Peter, James, Jude or John after God the Holy Spirit inspired their epistles/gospels published them with a view to making money!
It was money, wealth and riches that destroyed the Laodicean Church (Rev 3v17) and the same has destroyed many churches in the West and around the world today...It's long past the time that the Church got back to the spirit/principles/practices of the early Church, and earnestly seek God for His plans and power to fulfil those plans. Acts 2v40-47, 4v29-31.