Maybe the OP just created this thread with the aim of earning merit, but since he was not able to earn merit through this thread, that could be the reason why he stopped being active in this thread.
Have you taken the time to read the OP again? I don't think he created the thread to earn merit, and my reasons are; 1. If it is about the merit attraction, he would have made the heading only "Buy Buy Buy" and not added the "Sell Sell Sell" because that's the sentiment on the forum.
2. The body of the thread is too short, while the remaining part is questions and wasn't constructed well enough to attract deserving merits.