The most worrying cost of time spent discussing not-shampooing on LW is the opportunity cost, since it funges against talking about more important things. There's a smallish chance someone could've given me useful information (e.g. "actually if you don't shampoo all your hair will fall out") but that currently seems unlikely, so maybe we should just stop talking about it.
This is the public group instrumental rationality diary for May 1-15.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Next diary: May 16-31
Immediate past diary: April 15-30
Rationality Diaries archive