goodroi - 11:03 am on Aug 14, 2012 (gmt 0)
Back, back, back in the old days when Google & Yahoo actually showed backlink data to the public it was interesting to see how they valued backlinks very differently. Some backlinks would skyrocket you up in Google but barely move you in Yahoo. You might want to be careful when trying to determine value using paid link analysis tools. The different paid tools don't always agree and you can bet that Google's secret valuation won't match up 100%.
The way I value backlinks is by how much referral traffic the link sends to me. If I have a backlink and it sends me 100 people a day then it is probably a good link. If I have a backlink that hasn't sent me a single referral in a year than that link probably isn't very useful.
I have used this method to greatly slash the paid link buys of my clients. The clients are usually very worried so I start slow and show them a little test. I usually end up saving them alot of $$$ by deleting non-performing paid links (that Google had probably negated anyway) while their Google rankings and conversions stay the same.