PR for me is like great if you get it, but who cares if you don't. There are other factors and you can display them to your link buyers to get them to put their ads up. Try Alexa ranking {also a bunch of crap as far as I'm concerned) if it goes in your favor, like a good ranking then use it. Most importantly, BACKLINKS. Yahoo Site Explorer has a Badge you can put on your site that displays number of sites pointing to your site or sites pointing to a specific url. While it might not be 100% accurate, if it swings in your favor than use it. A good example of what I'm talking about is located on my signature. The ArmyVet site below. At the very bottom of any ArmyVet page there's an advertise link. Go and see what I did with it. Any suggestions from anyone would be great too on this......
Pr does have some weight in SERP. If your site is fine no worries just keep selling links to supplement your income.
Definitely No. I am facing this situation. I do'nt think that PR has matter for the search engine ranking.