The Gospel of Jesus Christ is the proclamation that the life, death, resurrection, and ascension of Jesus Christ saves sinners and is making the world new. Belief in the Gospel, faith in the facts of history, reconciles the believer to God because of what Christ has done, and continues to do in heaven and earth on our behalf.
Often in my time in the church “missions” is focused on the poor. If we bring the Gospel to those living in poverty, they will be more likely be ready to receive the treasure of heaven. I have never felt too good about this approach. In the Scriptures, there are two categories of poor. For example, there are the economic poor, and their are the spiritually poor (those outside the covenant). So, all Gentiles are poor because they are outside the covenant of grace and under the wrath of God. This is what I think the Gospel of Luke is addressing. Go ahead and read through it and pay attention to rich and poor themes.
The amount of money in the bank account is not necessarily a barrier to the Gospel, although it is true that a man of covetousness will have a difficult time entering into heaven (Exodus 20:17; Mark 10:25). The Bible shows us that the Gospel is the power of God unto salvation, and not even Mammon can stop the Holy Spirit from changing hearts.
Look here. The Gospel is for everyone and this truth is exemplified in the life of Christ. In one instance we see the economically poor man, a poor thief (Matthew 27:38), hanging on a cross (tree, Galatians 3:13) next to Jesus and he receives the Lord by faith and will be with Jesus in Paradise (Luke 23:39-43).
We also see the opposite. We see a rich thief hanging on a tree as well. Zacchaeus is hanging on a tree as Jesus comes by, and in faith Zacchaeus acknowledges Jesus as Lord and is saved (Luke 19:1-10) he even gives up some of his riches for the sake of his new King.
We have two thieves, one rich and one poor, both redeemed by the same Savior. The Gospel is for everyone, because it is the Holy Spirit who gives the treasure of faith (Ephesians 2:8-10), despite your bank account.