Rom. 6:22 But now that you have been freed from sin and enslaved to God, the advantage you get is sanctification. The end is eternal life.
Rom. 6:23 For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
Two sides of life are presented here in great contrast. One is a life of sin and enslavement to evil. The other side of life is freedom which provides the advantage of sanctification (or holiness as some translate the word) that leads to eternal life. The options here are a life of sin, slavery and death; or freedom, holiness and eternal life.
The advantage of holiness or sanctification is the benefit of the life of freedom. Jesus died so that we might be made holy like him and this is something that is offered as a “fruit” or “advantage” right now. The end is eternal life — but the living of life is that it can be lived out in holiness.
The next verse is really just an affirmation of the verse 22. Sin will lead …