$5 per merit, you should donate $5 per sold merit to the forum. selling merits to garbage posters would cost the forum, you should cover that cost. if you are going to pay, try to buy a copper membership and send $250 to that address if you have sold 50 merits.
This link will take you there. note that forum is not asking you to do this, I am suggesting you to do this and then show your TXID to the person who has left you negative trust. show some remorse. https://bitcointalk.org/index.php?action=credit;promote