This sort of parallels Slowman's editorial on climbers and why people leave triathlon. I met a couple not long ago who had completed IM Canada as their first and only triathlon. They dedicated themselves to a full year of training, ran the event and then that was it. They struck me as people that had tried everything once - scuba, skiing, sky diving, flying, etc. and then would move on to something new.

Just wondering if these one time wonders are common in triathlon.