Writing a letter with a half dozen rhetorical questions basically attacking their marketing position - and there's no response? You got exactly what you deserved.
You are under no guarantee that you can buy anything you want in life. Pinnacle has no obligation to entertain your request, and after the hatchet job made of it, probably enjoyed just filing it away under "Why we don't sell to wannabees."
As pointed out, the cost/benefits ratio is steep. Maybe, just maybe, non buyers have been dealt the better hand. Buy a regular vest and be happy. It's not weak because there is no gap parallel to the plates, something that has been used against mythical dragons, too.
Kevlar has been used in tires for decades with millions of miles of belting exposed to heat, humidity, and pressure for years. If this stuff breaks down under those conditions, why is it still being used? And retreaded, too?
OR, is aging a manufacturer's concept that provides them with a new contract every few years?
BTW, were the shooters in the LA bank robbery wearing new or used armor? Which brand? Didn't that stuff work?
See how a bunch of questions comes off annoying? Does anybody not get that?