And yes, the Bible does teach the "sowing and reaping" principle by way of encouraging generosity toward the poor and oppressed. It suggests that Christians will be blessed by such giving and provided with more so that they will be able to give even more to those in need. And yes, it also teaches that by the power of God and the sacrificial suffering of His son we can be healed from our infirmities. However, the Gospel also teaches that we are to deny ourselves, that the meek will inherit the earth, and that the poor in spirit and the mournful are blessed by God. In other words, the Bible tells us that there is a place for suffering in the universe and that God's people are not immune from it. No story illustrates this principle more than the story of Jesus' own betrayal and execution at the hands of one of his own disciples, an establishment clergy threatened by the Messiah's teaching, and an unruly mob. Through faith in Christ and with the help of the Holy Spirit however, Christians are equipped to deal with whatever comes their way, whether it be prosperity or poverty, blessing or suffering.
Just as important, the Bible also teaches that human beings are to be good stewards of the resources entrusted to us by our Maker, and that we will all be called to give an account for our use of His blessings here on earth. This includes Paul and Janice Crouch, and while they would insist that their stewardship of TBN's resources are honoring to God, they would likely benefit from some serious, Biblically-rooted soul-searching. Do multiple mansions, luxury hotel suites for poodles and clothing, and $300k per year fine dining budgets illustrate a ministry geared towards service to others or one designed for self-gratification and self-glorification? In the end, only God can answer that question.