Forum membership is a privilege not a right. Access to PMs is a privilege not a right. 20 posts is not a difficult target to overcome. If someone has had an account for nearly 2 years but doesn't have 20 posts, (once questionable threads and spam have been deleted), then complaints about forum mistreatment aren't going to be viewed sympathetically. That spamming is not part of the main forum's rules is probably an oversight. Most forums view spamming as a permanent banning offence.