Instead of asking to remove moderated threads you should be asking to have PocketRocketsCasino warned or temperorily banned. Moderated threads aren't going to be removed, but constantly deleting replies in self moderated threads in places such as the marketplace or gambling is highly suspicious behavior.
deleating posts in a self moderated thread is not against any forum rule however it is scammy behavior. When it happens as often as it does with PRC, it is a good sign that they are probably scamming so negative trust should be appropriate but no action by a moderator on behalf of the forum would be appropriate.
Yes, scams aren't moderated. Prior to leaving a negative feedback, I would suggest you to sum up the details and open a scam accusation thread and link that thread in 'negative feedback'. It will give more weight to it because if there is no reference, PocketRocketCasinos can tell they are jealous or they didn't like me etc...
-MZ