I always use both. I know you’re not “supposed to” shampoo daily, but I do anyway, and my hair doesn’t mind. I just love the feeling of squeaky-clean, wet hair.
You people who use the same quantity of shampoo as conditioner have got to be wasting shampoo! I mean, who cares, an extra few teaspoons of shampoo won’t break you, I’m sure, but you must not need that much. Me, I use probably about 3 teaspoons of shampoo and close to a half cup of conditioner. But my measurements are probably way off.
Me, too, and it made my hair feel unclean to me, so I stopped. I sometimes find myself stuck using a hotel shampoo that includes conditioner, and I always regret it.