no. It is so unbelievably easy to get a PR 3 on any of your current domains it is not a joke. Even if you have only one website, and can't be fucked going around looking to trade links, there are very simple ways of gaining such a PR.
Think blogs, guestbooks, etc. If you are smart, you will even find ones that don't require you to ever do anything other than registering at their site, creating a public profile, with a link to your site in it.
