Regarding book bazaar threads.... The more of them you have, the more likely you'll get knocked off the first page. Simple math. If you start 10 threads, then Daniel starts 10 threads, then Ed starts ten threads, you're gone.... Also, just because you don't responses on your book bazaar threads doesn't mean they're dead, check out views, not responses.
And remember, KBers are more likely to buy books from authors that post outside the book bazaar.