 You can't buy a miracle because Jesus already paid the price. The exchange of the monetary for the spiritual is sorcery and some sell charismatic witchcraft. Now, of course, there's nothing wrong with Christian books, movies, classes, and even Christian companies. But there's a difference between selling materials and selling miracles. If anyone ever tells you that your giving will increase the likelihood, potency, or permanence of your healing or deliverance, then you're being manipulated.