Bringing it back to the realms of affordable VFR day-only twins I can see why Chris Heintz isn't putting any effort into developing the Gemini. The extra cost of the 2nd engine isn't offset against the potentially increased risk of an engine failure. The reason I looked at this initially was that then I had the potential to be flying across to Ireland regularly and for that I would like two engines. I know the Rotax 912 or Jabiru engine that the Gemini would potentially use seem as reliable as your average car engine so the actual risk is relatively low, but half way across the cold Irish Sea I would feel greatly reassured looking past my 10-year old daughter at the spare "get out of jail free" card sitting on the wing!