When I look at the list of available plans and kits that Kitplanes compiles annually, I notice a dearth of twins and singles with more than four seats. I would think the trend would be toward larger aircraft as the ratio of pilots to non-pilots declines. Also, I would think the astronomical prices of standard airworthiness certificated larger aircraft would drive demand for homebuilt alternatives.
So, why are there so few homebuilt larger planes?