It amuses me but maybe for the exact opposite reason: Phrase it to the median person as "for just a quarter per day" (queue sad music on a commercial) and we'll be worried about everything but the cost because it seems too low to think about. Say "For just 1 of less than 500 such choices you can afford to make in your lifetime" and suddenly we start wondering if it's something that makes the cut.

Of course that's median, most people on HN... probably should just get the system if the Radon levels are high.