Personally think that you are generating posts from your thread you can also do that within a single post.
I post separate replies to avoid the clutter it makes when someone (as above) quotes my denial post. If I deny 5 people in one post and they all quote the huge message, the entire thread will be cluttered. Another reason is that it makes it easier to manage (check the first post, I get a lot of requests and fulfillments.) Of course, I do my best to exclude these posts from my signature payment.