Quote from DimebogI could get behind the idea that an item can be traded to a clan member but only if the guy was already a member of the clan when the item dropped. That way 3rd party websites wouldn't be able to invite their customers to the clan and sell items.
Look there is always going to be a way to gain an advantage. If you don't multibox, you're not maximizing your chances of loot in RoS. If you only sleep for 4 hours a day and play for 20 AND multibox.. etc etc.
If they allow you to only trade with your guild - there will be a d2jsp guild. Probably a d2legit guild too.
Not everyone has the same moral or ethics as you or the next guy. What you should focus on is only what affects you, don't go out of your way to concern yourself with others or their methods. Unless you're trying to learn something, you shouldn't care what person 139723938 is doing and let it affect you. I mean that's just general advice for life, not just gaming.