Now a days each and every body trying to get some pr links for his website but its matter of fact Google says do not buy links for your website , make quality and natural links, make minimum number of links but not a sheet one's.

Now days people are buying or linking his valuable website to website which pr has pr and with out cheking the history of the website, when you are linking your website check it properly that weather those links has any other scam history on the web or not from the archive.org.
So that way you can identify the quality of links or weather its drop domain links which is going to hamper your website valuation to the Google robot.

Because on his recent algorithm changes Google is tracking down those links which is coming from poor history webs, so be careful before linking.

DO NOT BUY FOOLISH LINKS AND CAN HAMPER YOUR WEBSITE VALUATION.

USE PROPER ALGORITHMIC WEBSITE MAKE THE BUSINESS.