Q: if i got a very good expired domain, why should I include it into my blog network? because it's powerful enough to be turned into my next niche / authority site. Q: All of the backlinks still count if I restart a site with expired domain? The PR won't drop? the juice will stay? if it's true then why so many people get a new domain then? Q: it's ok the host all the site of blog network within the same host? if no, blog network indeed is very costly to invest. because you have to maintenant them.