Mostly for convenience. In November 2021, I decided to have my head shaved from the barber, and from there – I will shave 3-4 times a week. I currently use 1 single blade razor for both my head and face. Once a week, I will change the blade to assure I will always have a sharp blade. Since the razor uses half-double edge razors, I am able to get a very good price out of them. I typically will spend 5ยข per week on blades, and I buy a 100 count (200 half-double edge) at once.