I like that Idea.. Even if they are pricey :)
I think that depends on the price. I know I won't pay $10 US for a single logo, maybe ~$2 US +shipping. Will they be made of aluminum or plastic?
I'm not trying to shoot down the idea of selling these but if that is offered, it should be reasonable. To be honest, I wouldn't mind a black T-Shirt (both with and without a pocket) with the logo silk screened (not iron on) over the pocket area, maybe a small variety for everyone to choose from. That would be worth $15 US + shipping to me. I don't know if there would be a large demand for it, large being 10,000 pieces, but it could make a nice little profit and some free advertising.