Good service = a good tip, regardless of who is serving. The service industry is not an easy one, and when folks are able to thrive in it I reward them. I have done it a few times, from behind a bar which included waiting on tables, food included, it was not easy. But I enjoyed it
On the flip side I also enjoyed seeing a few people tossed out when they were being an arse
On occasion I got to do this myself.