I have a bunch of sites that are PR4. I even have a ringtone landing page that is PR4! But I can't get anything above that. One site has a thousand backlinks: PR4 Others have a couple hundred: PR4 Others a handful: PR4 What is the deal?
I've heard it's about 10 times harder for each level, so rank 4 is 10 times harder to get than rank 3, etc.
you see a person can get a 4 by just playing around. I can get a pr 4 for any site without any real effort. To obtain PR 5 you must have handful (10+) of pr 6 backlinks / couple pr 7 (5) links / and about 20+ pr 5 links .... and than bunch of lower ones .... if you have this many legit b/ls ... you should have no problem gettin a pr 5. Now how can a site have 1000s of backlinks and no pr 5 ... thats because you have too many lower pr b/ls and not enough high pr links ... so all the pr 0s / 1s / 2s you had were making up the 999 of ur b/l count and tht 1 pr 5 was the 1000th one ... so you won't get a pr 5 that way.
My site is 2 weeks old and it has 1600 backlinks. I'd keep working... PS: Get 3 PR7 links that are good and you'll be close to a new PR6
Think of PR like the richter scale.... An earth quake of 4 on the richter scale is 10 times more powerfule than an earthquake of 3 and likewise a 5 is ten time more powerful than a 4... So to make your site a PR 5, your site has to be a PR 4 site X 10! That make sense?
just lots of backlinks is not enough. you need high PR backlink. get some quality related PR 6 sites link to you for long term. (trade your service or purchase link from them)