Perhaps we could have a member designed sticker contest and then sell them to our forum members?
This way not only would be supporting the site we would also have some pride and ownership in the design of a sticker.
The problem with shirts and decals is the time it takes to get it all sorted out. There can be some revenue there but someone has to get group buy in on the design, take orders from members, collect money, get a deal on the manufacturing of the shirts, pick them up, sort them out, pack them up, address them and hope that everyone get's what they asked for... It is a lot of time and work..