1. Tips aren't required. Ever.

2. Many people use rationalizations so that they can feel good about not tipping. "The hotel should pay their people better."

3. But that's not how it works in the US. Maybe could be done better, but it isn't.

4. I tip whether the item is "included" or not. The employee is still making the same minimum wage and it's the employee not the property who suffers for the property's service failure.