If a user is a burstposter then they can be burstposters not in campaigns unless the posts are super constructive and on point. Most times that's not the case though. Campaigns are a privilege, not a right. Users are not entitled to be in campaigns. If they cannot attempt to follow the managers rules, then they should not try to join.
Its better to make 1 quality post rather than 100 useless. Yeah its true that to fulfill campaign rules sometime participants need to increase his activity but it doesn't mean that he will have to choose the way of burstposting or spamming. If he isn't able to maintain his post standard then its pretty much clear that he isn't worthy of that spot to continue his campaign.
Special thanks to
TalkStar. Added all the Loan defaulters from his
LIST.
Glad to see those scammers in your list. Thanks