I think only DCA operated both Merlins and Turbine Commanders. In general commercial operators steered clear of both aircraft types and early versions of the Garrett engine.
Some of the
Conklin & de Decker variable (or direct) operating costs appear to be higher than actual aircraft operating costs. To the direct costs one must add the fixed (or indirect) operating costs, resulting in an extremely high total operating cost in some cases. However, the costs they give are a good guide.