Every now and then, I stay at a hotel that has a sign in the room to this effect: "A lot of our guests seem to enjoy the quality of our linens. If we find items missing when we inventory the room, we will assume you wanted to purchase them and your credit card will be charged accordingly. Our housekeeping staff have new linens available for purchase should you wish to obtain new ones instead."
When I do encounter such a hotel, I make it a point of not staying there the next time I am in the area; not because I have interest in their linens, but because they are indicating that they cater to a clientele of thieves.