That seems to imply loners tend to be more unusual in all respects, because of regression to the mean. If they weren't loners, they would regress to the mean of the people they associated with, which as the number of associates rises, tends towards the mean of the population.
So this theory explains the (anecdotally) observed fact that loners tend to be unusual people in other respects too.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.