Phi Beta has alumni dues on the national level. They are $50/year & include publications, funding for colonization, visits to chapters (including alum), etc.
Our national collegiate dues are either $30 or $40/year, so over the course of a few years in college and as an alum, I don't think we pay much more than those greeks who were maybe in bigger chapters at a big greek school. Ours is just spread out a lot more.