Lets think about this ...... if your photos are up on FB people who know and trust the couple might see them and like them which could lead to more weddings or portrait shoots wich could lead to more money and customers ..... I can see why a photographer might not want to give the couple good quality images to put up there ....
This bride wants to promote your work at no cost to you, word of mouth and referrals are the best leads and customers.
FB is here and people are going to use it you have two choices, be known as the photographer that wont work with customers and asks them to remove them..... or the photographer who is so great and his or her customers love the work so much they want to show it off to their friends ..... which one sounds better ?
Me personally I will take all the referrals and positive word of mouth I can get, it costs me nothing and it is free advertising !
Why not give them some good web sized images for their FB page what is the downside ? As opposed to crappy scanned images ?
Just my random thoughts......
Michael