Similar to Cocaine Decision an irrationally optimistic impulsive decision to start a vintage or retro small business, with no idea of who will actually pay good money for the flowery-heart-craft-thing, wavy hair or indeed cupcake, that is proposed.
"It's on handmade paper with natural dyes and each one takes 2 hours of my time so I think fifteen pounds for a birthday card is fair, right?"
"I love the whole retro look and at least 2 of my friends bought some off me so everyone will..."
"Have you thought that through? sounds like a cupcake decision to me..."