This snippet from the article makes me want to cry.
Guests should carry a sufficient amount of dollar bills to tip "just about every hotel staff member you come into contact with," says Whitmore, who founded a consulting firm, The Protocol School of Palm Beach.
When traveling for leisure I carry plenty of ones and quarters but it is for bus or subway fare so I can avoid having to tip a shuttle or taxi driver. I also stay in lower end budget hotels so no worries about tipping hotel employees either. Now traveling for work everything is reimbursed and I have no problem tipping shuttle drivers or hotel employees that help me with my bag or any other personalized service.
The only profession that I don't mind tipping is food servers, bartenders, and the like since they rely on tips because they are paid less than minimum wage, however shuttle drivers or hotel employees I will grudgingly tip if I do use the service, but I go out of my way as much as possible especially when traveling on my own dime to avoid using the service and thus the pressure to tip.