Then who exactly is your target audience?
One of the core ideas of effective marketing is that you craft a message that excites your target - and as a result, that that message will necessarily turn away others who are not in that target audience.
If we wanted to go mass market, then we should craft a landing page for that market.
If we wanted to go for math geeks, we should keep the site as it is.
If we wanted to attract neither, we could go to a middle ground.
I told an intelligent, well-educated friend about Less Wrong, so she googled, and got "Less Wrong is an online community for people who want to apply the discovery of biases like the conjunction fallacy, the affect heuristic, and scope insensitivity in order to fix their own thinking." and gave up immediately because she'd never heard of the biases.
While hers might not be the best possible attitude, I can't see that we win anything by driving people away with obscure language.
Possible improved introduction: "Less Wrong is a community for people who would like to think more clearly in order to improve their own and other people's lives, and to make major disasters less likely."