My challenge with buying at the gate is out of 6 trips per year, I MIGHT have one trip where I get to the gate when it is manned. And that is never the first trip of the year.
I've said this before, but I will say it again here. The entrance gate, at least at Bullfrog, is not good at all at enforcing the boat fee. A buddy of mine goes one trip every year with us. They always hit the gate when it is manned. And they always have to buy a vehicle entrance pass. Last year was the first year they EVER were asked to buy the boat pass. Even though they pull the boat into the park. Makes no sense.