Im only 15 and ive never had a problem on here selling stuff. I think you are correct in saying that some people are still very childish and dont seem to understand the correct procedure on how to see stuff , ie, pictures, good description , price to post . But i feel that is only a small percentage of the users on here, who just havent matured enough yet. I woundnt want to get banned from selling parts due to other people off my age not being as grown up as i am.