Most people thought when people shower (daily) it follows they shampoo as well. Wrong! Some people don't shampoo/wash their scalp hair daily. Some every other day, some weekly, some (corn row braids/ dreadlocks) monthly.
It could be inflation, it could be for the lack/ thinning hair, it could be for the emo look, it could be for the environment, or something else.
So, what's your shampoo regime? I have short hair so I can afford to wash daily.
I shampoo everyday to get rid of the wax/hair product I apply in the morning.