I love when people with "seo" in there nicknames asch such question Simply NO and secondly why do you care about PR is worthless
How many sites do you think there are under an established hosting company's server, there should be no high PR site that are not hosted on a dedicated, with that logic
I would use separate c-class ips for each site then use the a-b-c linking to get your PR up and lastly buy text links on high page rank websites to get listed and listed higher with google XonDemand has Video on Demand and will increase your pr