Im buying a cake ( 2 tier ) around 30 people we will be buying a cake from a lady who does cakes at home and let me just say her cakes are sooo pretty in decorating and taste. Well I was thinking of telling her to change my order for 40 people instead just in case. But of course there’s a charge difference $$ I mean the more people the more a cake can be. Well I was wondering is there really a big difference in size? with a cake that serves 30 to a cake that serves 40 ? Like if there isn’t then I’ll just keep it I don’t wanna spend more if it’s going to be the same you know.