The Delivery charge is a scam. Goes directly to Hotel's deep pockets. They already charge more for the food.

I work in a hotel where Room Service does not add a tip to the bill.
What you don't know is that a tip more than $1 or 5 is quite uncommon, even on a $100 order. I agree that most of you know where and when to leave a tip, however i have never seen a bigger abuse than in room service. It must have to do with the fact that it's private/anonymous.

I respect that regular travellers and FT's can tip, or sometimes no tip IS in order.

In Miami they used to add 15% and then word it something like this.....
We have added a 15% gratuity for your convienience(ya right), feel free to raise, lower, or cancel it depending on your ....
We're off to Miami in Oct & Nov. I guess we'll see if they still make the automatic tip optional

As to weather to leave a 20% tip when the service is bad...NO WAY

The argument is that they have to pay tax...
Perhaps they should adjust their service accordingly. I am generous!!!!! when it's deserved. But, ****, that all changes with bad service. And if it's horrible service, you get nothing but a word to the host.