i generally do not order room service b/c its not a good way to spend my "up to $$ / day" meals allowance (have to have receipts for everything so its not like i get to pocket it either), but I have always been amazed at the audacity of hotels which include "gratuity" and then put a line for "additional tip"... and i don't care if it has become an industry standard. it is just plain insulting, and as pointed out upthread, preys upon travelers who do not read their bill closely and just instinctively add more $$ on the "tip" line.