Not quite. CPs do get a maingate, with 6 days on it, for up to 3 people for each day. So even if you only bring in one person, you use up the whole day, so if you can bring in 3, why not? And like you said, you don't have to bring in the same people. What's not quite right is this: What they do, is when they bring them in to the park, they get their own ticket, which is a park hopper. So it doesn't use up extra days at all, and technically you dont have to be with them if they decide to go to another park later on, it's just a regular ticket. There are however rules that say you have to spend so much time with them, so you're not just giving out your maingate passes to total strangers pretty much, or trying to sell them.