Made this cake 14" square and 3" tall then carved into shape. It's double chocolate fudge cake with chocolate ganache as filling and crumb coat.
Designed the template myself and cut it out from thick card to use as a guide when shaping cake. Used free range eggs, real butter and expensive chocolate, etc. Coloured the fondant myself which takes time.
Everything is edible on the cake. The board is thick to support the heavy weight (1/2" thick) and alone cost almost £4. Including all colourings, ingredients, electric, wear and tear, box, board, etc the cake cost me around £30 to make.
This didn't include my time. I guess I spent 2 days on it altogether, including designing and cutting out template, mixing and baking, decorating, etc.
As I'm only a hobby baker, I don't feel my cakes are perfect enough, so I struggle to charge for them and, although I live down south, the ppl around here wouldn't pay much for a cake anyway (as they see them in tesco for £10-15).
I received £40 for the cake, and felt bad asking for that much. I do enjoy doing it though and every cake gives me a chance to improve.