I would definitely like a shirt, but I know my wife and kids will want one too. Anything to keep it family friendly would be my vote. I do like the girl and all, but I can't get away with that kind of stuff. Sales will be better if it's something you can sell to the masses, and not just the ***** few. Maybe you can have a seperate T-shirt for the 3G forum.
Travis has good connections for getting shirts made, as do I. We always get a limited number made for our groups annual outing, so it's not a big deal getting them made. Keep in mind that price will be regulated by the following:
Shirt style and quality
Number of screens needed (front and back definitely more $)
Number of colors used
Number of shirts ordered.
Generally speaking, the screening costs are a one time deal. Consequently, the more you can sell, the more diluted that cost will be. We pay on average about $12 a piece for T-shirts with one silk screen on the back in a single color. Of course we're only ordering about 20 or so. In the long run, it would be a good money maker for sure.