Do not disturb?

Who is putting out the do not disturb sign at hotels and then complaining that their room is not getting clean?  Who are you?  Why are you doing this to us?  You have ruined 'do not disturb' for the rest of us.  Now, thanks to you, we get disturbed.  That's right, the last couple hotels I stayed at have policies against using the do not disturb sign for prolonged periods.  The most recent made the sign only in effect for day 1, after that, they are cleaning your room anyway.  2 hotels ago, the housekeeping knocked on my door every day and made me sign a piece of paper saying I had my do not disturb sign out and didn't want my room clean.  In other words, I had to be disturbed in order to confirm that I didn't want to be disturbed, in two languages.   Funny, I thought that was what the sign was for.   Maybe instead of a sign, I need some type of banner.  A "seriously, disturb at your own risk" banner.  A lot of the time, its because I'm travelling and working late for work, and I want to sleep in instead of being woken up to sign my name confirming that I don't want to be woken up.  Maybe someday some when we all have personal droids, this won't be an issue as my droid can stand guard and sign my name for me, but until then, I'm very displeased in those of you who have ruined the do not disturb sign.  So long sleeping in at the hotel.