In my case, it's not because we don't have common interests, but rather because I haven't felt like informing LiveJournal of them. The one common interest we have that LiveJournal is aware of is joedecker (http://www.livejournal.com/interests.bml?int=joedecker) :-)

Looking at your interest list, I could probably add another 10 common interests. I suspect that would have an effect.