That is an option - some or all of the cake being completely fake, but I have honestly never seen one. It is just as common to go with a smaller cake plus the s

That is an option - some or all of the cake being completely fake, but I have honestly never seen one. It is just as common to go with a smaller cake plus the sheet cake for more guests. Most of these options are to cut down on the actual costs of the cake: It is easier to decorate styrofoam and much easier to deal with a smaller layer cake than a large sheet cake. I, however, did not go that route :)