I was initially thinking about this same thing too. I wouldn't want to stuff up my guests and I want them to really enjoy the cake (after all, it's quite expensive). Our dinner package allows us to either have our wedding cake as dessert or
a choice of their dessert which is Lindt chocolate mud cake, milk chocolate sauce and homemade Lindt chocolate ice cream which we really would love to have. So in the end I might just end up bagging the wedding cake for guests to take home
It really depends on your guests and how much they can eat really.