>>Some sort of maid service WILL happen every day, at the very least garbage collection.
Which means never leaving stray cash on a countertop as you empty your pockets. Staff will steal paper money claiming they thought it was a tip (but strangely enough they never take the pocket coins).
And THAT is the reason we always use the DND signs. If I’ve forgotten and left cash and jewelry laying around I don’t want one of the housekeepers scooping it up. Before we take down the do not disturb sign I always make sure everything is put up and kind of cleaned up.