In this Malachi for priests, the priests were guilty and God was very angry with them. But their guilt had nothing to do with offering defiled animals or tithing. That is on you and me for bringing soiled currencies or stuff that does not cost us. It is on us that we are not more like King David. He refused to offer anything that did not really cost him.
I have been in a congregation where they raised six million US dollars in one week. Why? Because their pastor did not teach church but focused on God. They consequently knew enough of God to know that He is a great King. And that his name is to be feared among the nations. But your pastors who focus on giving and service fail to let you into an important secret. God said he has appointed us to be priests and kings unto Himself. What God was accusing the priests of was their failure to teach the people about God. They were guilty of teaching the people of God about the church.