Wirelessly posted (BlackBerry8830/4.2.2 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/105)
Most hotels I have seen charge 18% gratuity for room service. I do not give extra gratuity unless the waiter does extra work (like set up breakfast on the balcony) in which case its an extra $2-3. I've never gotten a bad vibe for doing that but maybe I am just not picking up on it.