About two weeks ago I took a picture of all the face masks I had, which isn't many... I do not use sheet masks every day, but every two to three days depending on if I'm in the mood for it. I don't think it's necessary to use masks at all, unless you have really dry skin. Some years ago I barely ever used masks because I did not like the feeling of having a cold wet sheet resting on my face and the sticky feeling afterwards.
But as I get older I appreciate the effect of face masks more and more.