A second in command isn't a piece of lint on the other seat: the second in command is the person who assists the pilot incommand in normal operations, generally flying every other leg. The Second in command is also required equipment (notice the word "command'). When the PIC has an allergic reaction to the bee in the air vent (I've seen it happen), while you're preparing to fly an approach to minimums in convective weather with strong, gusting conditions at a mountain airport, or in the ice and you've just lost an engine, are you ready to do it at twelve hours of multi engine time, and be the new, acting pilot in command?
Shiny jet syndrome only gets you so far.