It cannot be stressed enough that good service and happy customers go hand in hand in the wedding business. But what really makes the difference is the little details that you do, going over and above what “has” to be done.
For instance: Tim Bursch talks in his blog about the difference in grocery stores between “Cracked eggs vs. rubber bands and extra bags.” In marketing this is incredibly true. Treat the client like you would want to be treated. Take extra care of them, and they will love you forever, and possibly even refer business to you.