Out of respect, we do believe it is necessary to send guests “Thank you” cards. Keep in mind that some guests have traveled great distances and gifted you quite a hefty envelope. It’s the least you could do. Some guests will go above and beyond to give you a very expensive gift or a large sum of money as a wedding present, so not only do they deserve a card, but also, a personal thanks. They will feel truly appreciated with even the smallest gesture.