I thought part 1 (http://jayporter.com/dispatches/observations-from-a-tipless-...) was particularly insightful:

"A certain small number of very vocal men (and it was always men) resented that we were not letting [them] try to exercise additional control over our team members. This was true even though compelling research has shown that servers do not adjust quality of service as a result of tips; instead the idea that the restaurant was not offering our servers up as objects of control, was heresy. For these people, the primary service they wanted from the restaurant was the opportunity to pay for favors from the server..."