Precisely. This is because there are none out there. Do you think a minuscule company such as Treadwright Tires would survive one incident of sidewall blowout? We all remember what happened to the tire juggernaut Firestone a few years back. It would destroy Treadwright. I know this, they know this, and everyone in this thread knows this.
The manufacturing process for both new tires and Treadwrights are nearly identical. The Treadwrights do undergo a very thorough inspection because, it's true ... they are used carcasses. Both methods utilize the vulcanizing process to adhere the tread to the carcass. Gone are the days of simply gluing the tread to a rotted junkyard carcass.
My testimonial: I bought Treadwright's about 16k miles ago. From day one they were balanced perfectly. They rode smooth, and tracked straight. They've been in rock gardens, high speed desert runs, sand, mud, rain, 5hr+ highway runs @ 85mph, high speed canyon sessions, burnouts, and much more. They don't leak air, they have minimal sidewall cracking (my own fault for using tire dressing), and wear completely evenly.
I'll probably get another 20k out of them. When they do finally go completely bald, I'll be absolutely ordering another set. At $700 delivered, another $600 savings over name brand. That's $1,200 savings for just tires. That'll buy me an air locker, or a trip to South America and back by plane or truck.
I'm no financial wizard, but $1,200 savings for a product with an IMMACULATE safety record is a huge no brainer.