Please look at the short free guide I made on my new blog (The Affiliate Kid). Spend Less on PPC Networks http://theaffiliatekid.net/spend-less-on-ppc-networks/ Best regards, Tristan G.
I've always found it works better the other way - start bidding a tad higher then slowly lower.. but thats just my opinion
Overall is consider average. It can be improve . Get a trial as what other people said and justified from that.