It is only our fallen tendency to accumulate that causes us to reason if we give more to the Lord we will end up with less for ourselves. After all, you can only cut the pie into so many pieces. A bigger piece for God must mean a smaller piece for me. And nothing makes Jesus words about "denying self" more vivid and punchy than regularly parting with bill-paying, pleasure- producing money to extend His church.
This is why, along with the Biblical commands obligating sacrificial giving, the Bible extends promises encouraging sacrificial giving. Repeatedly our faithful God promises faithful giving to the Lord brings His finest blessings into our lives.