The “heavy” end of GA has invested in Mode S and will not accept a simple low cost solution.
Hardly. It is simply that when I have a Mode S transponder installed (and it was obvious c. 2005 - FOUR years ago - that this battle was lost for anybody actually going anywhere for real in Europe) which cost me £2500, minus the $1500 I got for the old Mode C unit on U.S. Ebay, I am not going to have yet another gizmo in the cockpit stuck to the dash with a piece of self adhesive velcro, with the power lead dangling across the instrument panel down to the cigar lighter socket, which I have to push in every 5 minutes (because cigar lighter plugs are pretty crap and work loose) and if I fly above about 1500ft then I am statistically speaking higher than almost any mid-air in recent decades.