Premium Cakes are those which are made with premium raw material, best garnishings are used to make these cakes and are costlier than the average regular cakes. It's not like that the raw materials used in regular cakes is of bad quality. Like in a Plain Chocolate Cake Chocolate Compiund is used while in baking of French / Belgian Truffle Cake Imported French couverture chocolate is used. These couverture chocolates have chocolate butter while regular compund chocolate slabs have vegetable fats. Also the percenatge of cocoa solids are around 60%. So these couverture chocolates are generally more costlier than the regular compound chocolates.