Back in the day, in one of those K-Grinder MMOs that used to be all the rage. Gave my guild mate and I extra EXP, even more if we were partied up, and had some extra shit like special emotes and a title.
Can't say it was worth it. Like a month later, they quit, so it was kinda pointless to do.
Did attend a couple FFXIV weddings. Those were fun, if you were into RP.