Why don you include POD (print on demand) sites like Cafepress, Spreadshirt, Zazzle, etc.?
99% of POD (print on demand) designs are garbage. The problem is, anyone with Microsoft Paint can create a t-shirt design and make a POD tee out of it. We don’t want Teenormous filled with crappy designs, that’s why, as a rule, we don’t allow POD sites on Teenormous (though we do make exceptions if the designs are really good).