Dave,
Clearly there's an interest here in the shirts. I know I'd like one. How about doing a limited production run on them (you already have the artwork setup done, that's one cost eliminated) perhaps with advance orders only to see how it flies? If you get enough advance orders you can bump up production and offer them on a regular basis.
Ahhh yeah, most definetly you gotta go wide open with these babies, I think any member should be able to purchase these shirts. They're wild.
Besides if you charge a couple bucks over cost you can help defer costs related to the maintence of the site.
Please!!!!!!!!!!!!