Hotels going "Green"

Okay so how many of you out there have been in a hotel lately and noticed the little sign in the bathroom that reads; "In an effort to help us save water, please hang up any towels you wish to reuse and throw any on the floor you wish to have replaced." Or something to that effect. I have always been a person who reuses the towel for which I dry off with and I always hang it up when I'm done. It never fails that when I get back to my room the next day after the cleaning people have been there that ALL of my towels have been replaced. Now I ask you, does this make any sense. I asked someone who worked for the hotel once why this was and the only answer they were able to give me was that some people still hang up their towels but expect new ones in return. My response to this would be to leave their old towels hanging up and if they received a call to the front desk complaining you would simply state that based upon the SIGN in their bathroom that b/c they hung up their towels you were under the impression they wanted to reuse them. If this was not really the case then you can simply bring that particular room up some clean towels. Please who visit these hotels know how to read and if they get upset b/c they didn't have the sense to read a little sign in plain sight in their bathroom then they can just get over it!