People are funny. This past weekend's charter, the dive shop that booked me called 3 days before asking if tanks and fills were included. I said no, but I can rent steel 120's fill with 30%. He said, "oh that is a problem because we told the customers they were." Apparently the shop only had AL80s. I told him it was up to them if they wanted to bring tanks or rent mine. 3 people asked me for tanks. After the charter, the group leader gave me a check for the charter that did not include the tanks. He said it was up to the individuals to pay for them. I had to track them down in the parking lot to get payment and they acted put out to have to pay for the rentals. 1 of the divers didn't do a 2nd dive and I was nice enough to only charge him for one tank.
I like to hope it was an oversight on their part, but I don't think it was. In their defense, they group tipped the crew really well.