I've seen sites where you can get a VPS, to host unlimited domains. My question about this is, if all your domains point to the same IP (run off the same server), won't google not give credits for links between these domains because they're on the same IP? Seems like it'd be pretty expensive to go out and get $3-6/mo hosting plans for each domain to get separate IPs for all of them, so I know there must be a way around it.