Hey guys - I replied above (http://news.ycombinator.com/item?id=5173296) but the short story is that until quite recently we didn't have enough traffic to really help organizers sell their tees, and didn't want to imply that we did by offering a marketplace.

We also didn't have a huge amount of cool campaigns at any one time (up until recently) - which would have made for a pretty poor browsing experience!