Stan,

 

Space, weight and money…always the driving factors in designing and building an airplane… It’s just a matter of choices… J

 

I don’t know about the value of the aircraft with/without dual rudder pedals, but unless you really need the space, I’d install the dual rudder controls. They are handy for instruction…yours, or your “demonstrating” to others. You said that most of your passengers are not capable of flying the airplane, but there will be a few that are, and most of us have had occasion to allow our passengers to fly, to include take off and landing, from time to time. You could use the logic as a chicken/egg argument: No fully functional right seat controls, so no “passenger” takeoffs or landings?? Makes it easy to say no if that’s your pre-disposition; otherwise, I think  you’ll find them useful…

 

My two cents…

Bob