I think it would be better to remove the incentives of the copy/paste spammers and/or provide incentives not to spam (this way).
One suggestion I can remember came from a member was to disable topic bumping for the comments from users who are not at least a member.
I think this is a pretty fair deal. Earn some respects first before making a contribution to a topic.
Newbies and Jr members who are here to spam the forum in mind - they are welcome to make 100s of spammy posts a day but the topic is never going to bump. If they continue posting spammy posts then they are not going to earn any merit means they are not going to rank up either. If things go the same then eventually they will give up and will leave the forum. As a result you will also stop seeing services like bumping ANN threads, selling Jr member accounts etc.