Those who prosper at the Lord's expense are really under a curse. They may look like they have everything, or at least some of those things that we would like to have, yet in reality they are cursed. They are cursed because they have nothing more important than these short years on earth to contribute to. By contrast, by our offerings we are contributing to a kingdom and a cause that will last forever. We are contributing to something lasting this life that will still have meaning and importance to us in eternity.
Some people are so cynical as to maintain that all the church wants is their money.
I would say however that the church is the one place on earth where this is clearly not the case. You are loved by the Lord and among the Lord's people without your money and despite your sins and shortcomings. But it is also true that God loves a cheerful giver. And it's also true that a grateful heart is what God treasures most. Faith values God and so faith becomes our most treasured possession.