TCDiver1:
This discussion is a black hole by the way.
I think you're right. These threads pop up every few months and always seem to get sucked into/create the black hole you speak of. For that reason I'll post one last time, and closer to the original topic than any of my other posts so far. I'll be specific and speak only to my own experiences.
I've only done boat dives a few times in the seven months since I've been certified, a dozen dives or so out of about 60. I do a lot more shore diving.
My first boat dive was for OW checkout dives for my wife and I on our honeymoon in Hawaii. It was about a three hour trip (dive spot less than fifteen minutes from the dock) with two dives. I think I left $20 in the boat's tip jar, for the both of us.
We did the next two dives the next day. We, along with our instructor were the only ones on the boat (~30 foot boat, could've handled maybe eight divers) other than the captain. She was furious with the owner of the dive op for "making" her work that day and let us all know it immediately. Apparently there was some conflict as to the schedule. She had someplace else she wanted to be and complained about the boss the entire trip.
She informed our instructor that both dives would be the bare minimum and she expected to see us all back on the boat in exactly 20 minutes. She was friendly enough, sort of, but we were VERY disappointed to be rushed and not able to enjoy any sort of sightseeing with whatever was left in our tanks after skills like we had the day before.
She may have been expecting a tip, but that expectation was anything but justifiable (in my opinion) and she got nothing.
I've done two boat dives here in sunny SoCal. On one boat the food was included and amazing, hot snacks in between meals, the DMs actually took our fins off of our feet and handed them up to the deck while we kneeled on the swim platform. They got $30 in the tip jar for me alone.
The last boat dive was nice enough, gave good briefings and answered my questions, but no one went out of their way the way they had on the boat I just described. The food was burgers and such (not included), with candy bars and soda available for purchase. They got $20 in the jar.
I don't know if divers are stingier with their tips than fishermen, although I'll admit I'm now curious. I wonder if it has to do with (hopefully) walking away with several pounds of meat. I wonder if spear fisherman comprise some middle ground.
Anyway, hopefully that's helpful to someone or other.