IMMHO, by nature good people trust, and so many new players are naive to the fact that there are bad people on these games. And I've seen some pretty nasty players in my years on RS.
Many newbies to games, don't realize that someone is just pretending to be their friend, when the entire time, they are being lured, or scammed. I think keeping it as a rule is a good thing.
Besides, we should remember, every day there are kids that are growing up and getting their first computer. They will be looking for games to play. I want to think we all are looking out for their interest also.