I purchased a 20S dual set that comes with the original boom mic and x2 others per unit so x4 other mic's in the box which I do not need.

I suggest selling the base screw on clamp home unit only (mic's as an optional extra - which you already sell)

Sena already does this for the 10 and 5 but not the 20 --- Why not.

You are loosing sales because of this, I know people who are buying other makes for this reason.