When it is time to market an idea or product there is lots of things one needs to be prepared for. The ten sided dice is developed based on research on what investors want to know about an idea or product which is being presented to them.
It is one thing to know what investors want to know but a different thing to be prepared to answer those questions concisely. The games object is to answer the questions quickly and get response from other participants.
Playing this game with others is a much more effective way than practicing in front of a mirror since the mirror is not big on constructive criticism.