I despised the automatic tips for parties of 8 or more and refused to do it at my restaurant for several years. But in the end I had to change my policy and require it to be added. It's amazing to me how some people prior to the change would come in with a party of 25 and after they all chipped in "their share" there was nothing left for the server since a lot of the guests would calculate $10 dollars for my dinner, $3 for my drink, so my portion of the bill is $13 dollars, and then contribute the $13 to the collection. They forgot about the appetizer they had, or the other drink, or the 7% tax.
I didn't like having to do it but I also have to assure my servers of making enough to continue working at my place.