There has been a trend where brides chosen to display gorgeous fake cakes at the wedding reception, and then hiding in the kitchen are sheet cakes that are intended to serve the guests.
There are good reasons to have a fake cake on display at your wedding reception. One, If you have a small guest list, but you wish to display a large wedding cake (which would be way more cake that what you need to feed your guests), a fake cake is definitely a very good option. Same reasoning can be applied if you have a large guest list. Second, if you have decided to have an ice cream cake at your summer wedding, a filling that requires refrigeration, or a large dessert/sweet treat table, then displaying a fake cake will still give you a traditional wedding cake presentation.