Actually the problem is that majority of the cases we have seen that newbie opens the thread something and after that they will never respond to any messages as if they have done the deal. If that is the case than locking the thread is the best option.
This is the most case in the newbie thread where they just open the thread and respond for 2 or 3 reply and then they just vanish and the troll posting goes on. In this thread also the same case
Not troll posting, its called signature farming. Which you & everyone in this thread and beyond are engaged in. Except the newbies offcourse.
Newbies are creatures of pure intentions.