It's already been proven on the server multiple times that marriage is not a good thing for this server. People have been "married" on this server before within their towns and such (Not by a plugin) and almost within a few days they get into a fight and "break up" and both participants are angry with each other and upset as well. Usually over simple things from what I remember, like "Oh she wanted to move in" or "He wanted to move my things in my house to how he wanted them".
It's not a necessity to have a plugin devoted only to marriage and such, there have been enough problems from people jumping into "marriage" by themselves without the help of a plugin to make it more "official". We've had a lot of marriages at one point in time, and almost within the week they were all divorced. So from what I can see, we'd only have people getting "married" with this plugin, and then dropping said "marriage" within the week, because they decided they no longer wanted it.