I'm not sure that there's a lack of creativity involved in the sort of context of the plate situation. The real issue in the context of the plate seems to be a general heuristic that people aren't trying to deceive us. In order for society to function this is a good heuristic to have. Countries where people trust more are generally more prosperous and while there are correlation v. causation issues here there's surrounding evidence which suggests that there really is a causal link from high trust to more prosperity.

That said, the notion that being able to do this and think creatively when one knows that a trick is involved might be interesting and the idea that it would help promote creative hypothesis generation is intriguing.