Nah. They've been used for decades on commercial passenger aircraft. No development costs for the switches as they are already certified. And nowhere near hundred of pounds, or dollars, but yes they are probably in the $50 range for something *almost* identical to what you can get at a hobby shop.
Just a matter of adding them & coding for the input.
Much of the extra cost is for traceability. If a 50c screw breaks in your car, it probably won't matter. If one breaks on a plane it can kill hundreds of people. EVERYTHING is traceable back to the manufacturing batch it came from, so that if a failure is traced to a part, the parts from that batch can, in theory, be pulled off every aircraft it is used on across the world. For a commercial airline, every job you do has to be signed off & countersigned that it has been completed to the manufacturers specs, quoting manual number, revision, date and parts used, (with batch number). If something happens, it can be traced to who & what. And if it is YOU that caused it...
There's a reason we called finishing a job, "Signing your life away."
Biting the hand that feeds IT
