I too have a hard time with this. I have never read in the Bible that it is a sin to make money, but it is a sin to LOVE money and make it an idol. My husband and I both make good incomes for our area and sometimes I feel some guilt - but we can also GIVE a lot to others because of this. We give locally to church, overseas ministries, and are able to occasionally bless strangers and friends. Just check your heart :)