BillySpey,

If you don't care if you catch fish any color will do.

Hum, I average 35 to 50, 12 to 16 inch cutts per outing of about 4 hours. I fish from a pontoon in high Mtn lakes. Crystal clear water and fish rising so cast to them. MY Bright orange flurled leaders are only about five ft in length and I add a 3 ft tippet.
So, I think that whatever works for each fly fisher in your home water would be perfect. Do not assume someone else needs to use what you prefer and that they do not care if they catch fish. I find your statement insulting and are numbers actually all that important? I'd say presentation is far more important than color of a leader. Just my 2 cents worth.
Come fish with me and I will & can show you. More than one way to catch fish.

Denny