I always tip at an AI, but not for every single drink, etc. But with respect to the wedding I have been working on a list and numbers for what we want to do and think is appropriate. Everyone is different so it's tough to just do what everyone else is! Some people tip everyone, and some only tip the coordinator, photographer, etc. It's tough.
I am thinking the coordinator, the wait and bar staff, and the set up/tear down people. Possibly the mariachi, but I am not sure yet. I will also tip the photographer after we sit down and see the pictures together. I will of course tip at the spa.
How much? have no idea!!!
I had my friends who have been to DW ask their friends who they tipped. 2 said just the WC, and the other just tipped the photographer! That didn't get me far! ha!
If you are already paying 15-18% on a specific service, I personally wouldn't tip over and above that, unless someone was phenomenal. Seems unfair to have to tip twice. Just my thoughts.