Why would you do that? In plenty of subforums newer members still have perfectly valid questions and responses. I only ignore two or three people on the forum and it's been like that for me since the day I joined. If an option for this was added newer members would find it even harder to earn merits to reach their next rank.

Spam is nearly nonexistent in some subforums and rampant in others. We simply need to add moderators to some subforums or swap out moderators for more active ones (much simpler than adding 20+ people in to look at everything posted, which would be almost  unfeasible considering how many posts are made every second here), and a solution to revive spam-ridden subforums like Bitcoin and Altcoin discussion. Pretty much no actual discussion goes on there, just broken Google Translated English and pasted responses.