Spoopa, I suggest the guys in the tackle shop have more interest in your $, than you catching fish, I have put spots on lures (about 25 years ago), never made much difference, a bit like stripes, on the day they may be dynamite.
I prefer KC's, Phil, and V/mans theories, they sound logical!!.
As for me, I am covered in spots (freckles), and these are failing to induce any mating impulses in the local females here, and I am still alive, so there goes the 'Kill Spot' theory.pete