God's Word causes things to increase just as rain causes crops to increase, but the increase is not always numeric. Often, it is qualitative.
God is not after our pocketbooks, and those of His servants who emulate Him will not be either. He is interested in our character and our regard for Him.
The Pastor General of a well-known church made a statement that turned the giving of offerings into a competition and a rich man's game. Is this God's intent?
God can take satisfaction that He is doing the right thing, and thus His rejoicing can even come from painful judgments. Sarcificing and rejoicing are linked.