I didn't read that bit, but I kind of see what you mean. The main blurb explains it a little more clearly. Maybe the small print should say "One guest will pay £19, the next will pay £2.50. Pricing continues in this way for as many guests in the party..."
I've managed to persuade my parents to join me on 2nd June to the park. They used to take us every summer during the glory years and when they last went (year 2000 I think) they were so disappointed with how the park was and they haven't been since. So I'm really hoping that they enjoy the park as they will see it for the first time in over a decade; plus I now have built in babysitters for my little girl :)
I've managed to talk Zero people in attending. So if you see a chap wondering around on his own, looking confuzzled and lonely it will probably be me. Although there is still time....
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It's always the cracked ones that let the light in.