Honestly, we're probably all just huge nerds. Or maybe, the sad reality of it is that cycling in general is such an expensive and elitist sport that it mainly attracts people who are financially quite well off. And in most western countries, academic success is very strongly linked to financial prosperity. Rich people, statistically speaking, still have much better chances in academia and generally much better access to higher education. Therefor it is probably not a coincidence that people who ride bikes seem have above average education. I'd like to see a venn diagram on this sociology of cycling.