What advantages are for members?
First of all, you are making a promise to someone you love right here, in your church home, inviting God to be at the center of your marriage. That is a pretty great thing itself. Additionally, normally if you or you immediate family have been an active member for a year or more, then there are substantial breaks to the costs of the wedding.
Someone may ask, "What is an active member?" That means someone who has actually joined the church family and has regularly attended worship in the last year and has been an active part of the church family (and is not listed as an "inactive member" or who has been removed from the church membership).