I know I had a flippant response on but I've been thinking about it more.
Yes, your standard person who plays a free rpg is usually someone who has played rpgs and has decided that they want to try them out. However, do you ignore the person who doesn't know that and stumbles across it? I think you should have one, because those that know better can, and will, just skip it while those that might get some benefit out of it would miss it if it isn't there.
Bollocks to tradition indeed. So if you do have such a section, it should be informative and different because that way it will at least amuse those who have seen it a million times before. Or just scrap it and do a standard introduction rather than a "This is how you do an RPG thing."
Will have to think more about this too.