I have to agree here. I have a step son that is 14 now and likes to help with the car and I like to have him with me on the forum so he too learns early the value of a community such as this and that sharing information is a good thing. I also want him to learn without all the other stuff that tends to creep in sometimes.
I too am not saying that is what you would do, but with such things if you give a little someone is going to try and take a lot and then if you draw a line the inevitable questions comes "Why didnt you change that, or block this" and so on. So instead of getting to that point its probably better in the long run to just keep the site focused on the cars and the community.