Exactly, wild~sasparilla. I don't mind if you point out something is homemade, but if it's for something where it's not always expected. Like homemade puff pastry, homemade pasta, homemade marshmallows, etc. But if you're selling cakes, what else would the frosting be but homemade? Why would I be interested in buying cakes from you if you aren't bothering to make the actual components? And especially whipped cream?! I love whipped cream as a frosting, but it's not exactly difficult to make. Take cream, flavoring of choice, sweetener, whip. Perhaps stabilize with gelatin.
It's not exactly French or Italian buttercream or Chiboust (all of which I would assume to be homemade if you're trying to sell me cakes).