I received a tee like that for my son once. It was cool because they had a product that went along with the shirt and the shirt itself was free.
Without thinking about the damage of the design I would never sell someone a shirt like that. When I buy a shirt I want to put it on. I don't want to wash it first. I want to at least enjoy that brand new look and feel.
I think it's a fine idea for freebie shirts but don't sell someone one of those.
Why not try creative packaging? For instance this site sells there tees packaged like tennis balls.
http://www.tennistease.com/
My site deals with a lot of graphic/ graffiti artist so I'm thinking about maybe having cardboard frames made and framing the tees for package.