It's all going to depend on your attitude. If they want to out-do your wedding, just let them. If you have a wedding that is wholly authentic to who you are your partner are, then it won't matter what other people are doing. I've been to a lot of weddings and to be honest, I can't remember what the bridesmaids were wearing, the food that was served, the favors, the flowers, etc. Even for weddings that I was in (alright, I remember the bridesmaid dresses for those). What everyone remembers is the tone of the wedding (was it fun?) and how totally in love the bride and groom were. It's frustrating when someone copies your idea before you get to use it. But really I guess everything's been done before, so if it makes sense in your wedding, go ahead and do it and forget about everything else.