Actually I'm on record here as stating that I believe that all people should be remunerated equally regardless of effort so in a round about way this means I oppose tipping. I do tip when I dine out because these workers are dependent on the tip but really I think the entire idea of a sub-class of servile jobs that receive lower than otherwise legally allowed wages and so are dependent on the largess of consumers is more than slightly distasteful. It is downright disgusting. If you wish to support such a classist job categorization you are free to of course but that seems an odd position to take if one cares about economic justice.
John Thornton