Most of these tips are precautions. Just try to buy and sell from someone who has a good reputation and wants to maintain it.
The only issue I have with following these tips is it encourages people to not go to new users...but for good reason. I just wish there were more people in my area selling/buying bitcoin
This tips are safety precautions . If you dont trust the new trader how they can trade? We must paying attention who have a good reputation but, also in the beginner's because all of traders that have good reputation are also begin to beginners so dont snob and pay attetion to new traders . And if they have a good offer? And you snob them? The opportunity will lost and they will not try again yo trade because theres no anyone that will get their attention.