Well - I was visiting Muir Woods National Monument today with my kid. We've already got an annual pass, which is $20 and admits everyone traveling in the same vehicle (hard to tell though since it's walk-in only entrance) or the holder and up to three guests. Well today I saw a large group. They had two seniors and asked if there was a discount (none except if they got an lifetime pass if they were US citizens or permanent residents). So they just say OK - and paid $70 for 10. The annual pass is $20. I'm guessing they came in two vehicles.
I asked the guy handling my entrance why they don't just recommend to people that they get an annual pass. He said it wasn't their responsibility. If the visitor knew about the annual pass they'd handle it, but apparently they don't volunteer that. I also found another volunteer working inside and asked him about this. He said he occasionally works the entrance, but that perhaps they have a standards manual for what to do an what to say. Apparently he didn't work there often enough to go through it. He did say that he thought the annual pass was a great deal, especially since it costs less than three individual admissions and pays for itself with just three people.
I've used for-profit businesses where employees were free to tell people how they might save money. I remember flying an airline where the family in front of me had two bags slightly overweight (limit was 50 lbs and each bag was about 2 lbs over). The agent suggested maybe taking a few lbs out of one and transferring to the other so they only had to pay for one overweight bag (the final limit is 80 lbs where they refuse to accept a bag), but the family declined. Their primary language wasn't English though, so I'm not sure they quite got the point. However, they tried and suggested it to help them out. I didn't get that sense. I even got a sense that there was hostility at the entrance station that it might cost them revenue.