You know the generous grace of our Lord Jesus Christ. Though he was rich, yet for your sakes he became poor, so that by his poverty he could make you rich.
2 Corinthians 8:9 (NLT)
What did Paul mean when he spoke of the poverty of Christ? He asked the Christians in Corinth to support the poor financially. It was neither an obligation nor a requirement, but a proof of love on their part. Moreover, he wanted to teach them to follow the example of Christ who, in love, gave up everything – His wealth and His glory – for our salvation. Choice that made us children of God.
By becoming poor, Jesus accepted to embrace our human nature, experiencing our weaknesses and our desires. If He hadn't, He would be in His glory with the father while we would still be in spiritual poverty, losing all contact with the father. The wealth Paul is talking about here has nothing to do with money or material possessions, but rather with grace, forgiveness, and the presence of the Holy Spirit that guarantees our salvation.
If Christ accepted poverty in a mortal body, it is to ensure our eternal security in order to make us His treasure. In this transaction, money has no place. What really matters is God's grace in Jesus Christ in exchange for our faith in His death, resurrection, and His place at the right hand of the father to intercede on our behalf.