“Speaking the truth in love, we are to grow up in every way into him who is the head, into Christ, from whom the whole body, joined and held together by every joint with which it is equipped, when each part is working properly, makes the body grow so that it builds itself up in love.”-Ephesians 4:15,16
Where there is a real priesthood of believers gathering together regularly to minister to the Lord and to each other, each member of the Body is pressed to know the Lord in a real and living way.
If I come to a meeting each week where there is no pastor or “minister” present to do the work of ministry that all the saints together are intended to do (see Ephesians 4), then I will be conscious every day of my responsibility to not come to the meeting “empy-handed” (see Deuteronomy 16:16,17).
If I know that I’m a member of Christ and that His full expression depends on my practical functioning as one of His Body parts then I will be driven to seek after and experience the Lord in such a way that I am filled with His riches, ready to share them with other brothers and sisters when we meet.
This is just one practical benefit of meetings where every member supplies something for the building up of the Body. There are many more. 🙂