I think the difference is when you are buying a forum account you buy all the forum account (so also the positive, negative and neutral trust // with all his history). The problem is the "practice", and it is obviously that is not so intelligent buy directly trust when you can buy a "green forum account".
I don't understand. You seem to be emphsazing the point that there's no real difference
in principle. The question is this: why would it be okay to purchase a new account in order to subvert the trust system but it's not okay to simple purchase trust to subvert the trust system. They are both ways to subvert the trust system but one is okay whereas the other isn't.