I think you might find that someone without a job is interested in jobs from any source. Having a crowded job board is not a bad thing. If you think some of them are fake or scams, you should vote them down or point it out.
Totally agree about that
And since the thread frequently gets posts for atleast 2-3 days after it's created, I make use of the upvotes to keep track of the postings. I upvote the posts once I've read them. So the next time I visit, I can just skim to find unread posts.