Your expectation that more donations would come from well-funded regions relies on the assumption that well-funded companies are more likely to donate. The opposite may be true, since the founders of bootstrapped startups can make such decisions without concern about what their financers think about it. The first corporate sponsor on that list, Snowtide, is bootstrapped. I don't know about the others.

http://groups.google.com/group/clojure/msg/63edf75cb78ae7e6

P.S.: Another corporate sponsor has been added, Relevance from NC, also east coast.