This is common Christian jargon. Unfortunately some are deceived by it into thinking that a preacher who is doing well financially is thus obviously blessed and therefore of God . False prophets are often well paid while true prophets are often persecuted. Paul was not prosperous and Peter had neither silver or gold. The heroes of faith in Hebrews 11 lived in holes in the ground .
Riches are no sign of approval and poverty is no sign of disgrace.
By being so averse to preaching, teaching and theology that we are uncritical of fads, trends and obvious deceptions. They become open to deception and end up reinventing the wheel , going through all the ups and downs of the early church and all its heresies. That can be very costly and is an attitude that Scripture associates with the fool in Proverbs. If there are miracles it must be OK - there are still genuine miracles happening but not all miracles are from God and some miracle workers are in fact workers of iniquity . In The End Times.