i do it less to save my color from coming out so fast.
not shampooing does not = no shower or cleaning lol
but a person shouldn't be shampooing EVERY DAY unless you have some kinda dirty job or you sweat balls alot.
your scalp needs your natural oils and crap, should never be dry,
i scrub the crap out of it every time i shower, but i just don't use shampoo every time.
if you dont use any kind of products daily on your hair, try a normal shampoo every 3 days,
and you should find some spendy vitamin conditioner (not one that cleans) just for health. daily use