One cost that has not been mentioned is the insurance premium on a motorglider. Potential hazards and risks aside, you are paying your premium based on a much higher hull value. Anybody care to chime in with premium costs on say, a DG-400? That would give a decent reference point when compared to a pure glider of the same era and roughly the same performance such as the ASW-20. Newer ships will have bigger numbers for sure, but it would be interesting to get some data.