1. If I buy a number of links from PR5-7 sites for 3-6 months, will this affect much on my site's PR. 2. Another case, if it goes very well and my PR increases. So I canceled some links that I have purchased. Is my PR gonna decrease because of some 5-7 PR sites have removed their link to my site or the current PR will never go backward?
Answer 1) If there are no many outgoin links from that particular and and your site remains on High PR site for 4-6 months , then yeah it will increase your PR 2) May be, because we see drop of PR after the link has been deleted, but if you have link on High PR site for 10+ months and than you remove, than it wont probably drop your PR ( thats what i have seen with my website ) Thanx
Your PageRank is a reflection of the pages linking to your own, if you loose some inbound links, expect your PageRank to decrease; if you gain inbounds, expect it to increase. Just keep in mind that the changes may not be sufficient to be reflected on the toolbar.
It can help you in increase PR of your site. If your links decrease then your PR can go backward. Google PR are not static. It count on number of backlinks for that perticular time.