Let's see.....you have skin with sweat glands producing sweat and grease continually and yet you won't wash it daily like you do your other body skin. And add to that your hair acts like a catchall filter, picking up anything and everything that floats near it.....and yet you won't clean it daily.
Nasty is about all that can be said for that.
As for it strips all the oil "out of your head", whatever that means, ever consider using a conditioner to replace the moisture and oil that the shampoo removes from the hair itself? After all, not much you can really do to "hurt" your hair as its already dead when it emerges from your scalp...