I think it's an interesting idea, if a bit expensive. Until recently, my wardrobe has consisted of nothing but tshirts with things on them. Now it's all solid-colored, but I wouldn't mind wearing a cowboy physics tshirt now and then.
I'd kind of like to see it, but as people said, it's a bit expensive, especially for one person to swallow. I'm interested enough that I'd even help you pay for the startup costs if you decided to do it. Maybe if people are interested enough, we could take up a collection?
Hrm...giving a Tobor cornhole tshirt as a gift...