Piper has an excellent and challenging sermon here on the complete contradiction between the prosperity gospel and gospel-centred mission.
Here are some excerpts...
"At the heart of true biblical missions is the willingness to die to the cravings that prosperity preachers exploit. At the heart of true biblical missions (both for the goers and the senders) is an eagerness to live simply and give lavishly. At the heart of true biblical missions is suffering, not merely as a result of proclamation, but also as a means of proclamation—a means of making the saving sufferings of Christ known to the world. As Joseph Tson says, “Christ’s sufferings are for propitiation; our sufferings are for propagation.....”
".....Of course, contrary to what the Prosperity Gospel teaches, wealth is not usually a blessing. It is usually a curse. Jesus said, “It is easier for a camel to go through the eye of a needle than for a rich person to enter the kingdom of God” (Luke 18:25). Wealth is a mortal danger for those who have it. It does not make us generous and humble. It makes us buy more stuff, and it numbs our conscience because we have to blind ourselves to our inconsistencies with the Calvary road.
Paul said to the prosperity preachers of his day, “Those who desire to be rich fall into temptation, into a snare, into many senseless and harmful desires that plunge people into ruin and destruction. For the love of money is a root of all kinds of evils. It is through this craving that some have wandered away from the faith and pierced themselves with many pangs” (1 Timothy 6:9-10).
No, it isn’t for lack of money that there are 1,568 peoples with no missionaries. It’s because we have so much. The comforts of the West have made us soft and cautious and fearful and indulgent and self-protecting, instead of tough and risk-taking and bold and self-controlled and self-sacrificing. When prosperity preachers fly their personal jets to the Two-thirds World and promise the poor that if they believe in Jesus, they will get rich, they are not doing Christian missions. They are destroying its foundations. That is not the gospel that saves and produces sacrifice...."