TIPS - To insure prompt service
I use to work in the service industry - Was trained in a 5 star resort in Ontario where tipping was not allowed and a service charge was added to the bill shared by all the staff. From time to time a guest would leave some extra $$ behind. Sometimes they would leave a penny - This was sign ( from the old british club system) that you gave good service. At the end of each quarter the resort would pay us our tips in a lump some based on the hours we worked, we would all go out and get drunkkkkkkk.
Those were good times, I actually lived on the resort property for 2 years before moving west. When I got out west I used serving to support myself through University - Both my parents were gone so I did it all myself, I took some student loans to pay for Books & classes. But the rest of my expenses were paid out of pocket from my tips and wages.
I side with Hot Pizza on his comments, here is generally how I tip.
10% for just service - Coffee counter, server going through the motions, cabbies, Barbers......keep in mind in a restaurant the servers also tip out the Bar, kitchen, hosts and bussers - good teamwork should be rewarded
15% for genuinely friendly & timely service
20% for good recommendations + the above
Hotel Staff such as doormen, porters , maids, concierges fall into a different category for me I usually tip at the end of my stay except for the doorman who bring the luggage up
To Answer the question - I tip the ticket window both coming and going it feels good - I know they appreciate it they always say so. I also tip the dealers when I leave the table too. Both those jobs are thankless jobs and they have to professional at all times
I feel very fortunate to be where I am in life, a couple of wrong decisions could have sent me down a very different path. I have no problem tipping people who are professional, trying hard and making a positive experience for me in the moment.