Many Christians give out of tradition rather than understanding biblical principles behind generosity. The Old Testament's three tithes teach us about supporting the church, caring for the poor, and investing in self-care. Churches receive no government funding and rely entirely on member giving to operate.
The Macedonian churches exemplify joyful giving even during severe hardship, giving voluntarily and sacrificially because they first gave themselves to the Lord. Paul doesn't command a specific percentage but encourages giving according to our means, with the goal being equality rather than creating hardship. True Christian giving flows from genuine love and care for God's kingdom, not obligation.