Although I really don't have much of any experience with clans, I did attempt to start one (we didn't make a page for it on the forums though) and it's HQ was probably the most successful build I've ever worked on. And I did not work on it alone. My only other "successful" builds were small, and solo. Not very great IMO, and I lost one in a saving accident (saved another build over it.)
So I see why having little actual "clan" projects might be annoying. I think that if, like you said, clans worked together to actually make something, they could do well.