There are no tip jars on our dive boats, and we dont ask for tips, although we do gratefully accept tips if given. I dive every dive of every dive trip which comes out to a minimum of 32 dives a month with the customers who opt to dive with me. In between dives I do the usual customer service things like helping to serve lunch, drinks, changing out tanks (unless asked not to), taking care of whatever problems customers might have, answering questions, general socializing, etc., etc. I have found that the vast majority of our divers come from Europe and they dont tip, period. Then come the divers from South American and the Asian countries, they usually dont tip either. Next come the divers from England and Canada, they tip very seldom. We get very few divers from the USA where they do tip most or at least the majority of the time it seems. Good thing I love what I do and have a retirement from a prior non-diving related job!