Been with Pricegrabber over 5 years. We had tweaked our feed to send very little product to them, conversion rate just wasn't there. We reset our filter a couple weeks back as an experiment and let more product flow through and just now I started looking closely at our in-house tracking log.
I see strange bursts of traffic on various items, a lot of it originating from a facebook URL that was not a proper referrer and the IP address was always the same. This seems strange since the end-user's browser, in most, not all cases, should reflect the user's IP. Facebook isn't functioning as an ISP and proxying the end-users connection, unless something funky is going on with frames, etc.?
Also seeing lots of clicks from sources where there is NO referrer info, and IP address repeats. Yes, I know not all clients will properly send that info, but in my 15+ years experience on the net, it has always been a very very small minority of clients.
No way to tell if Pricegrabber is doing any funny business to increase sales but I think in most these situations it is affliliates playing games to make more money and sites like Pricegrabber don't care as it makes them money. At least they don't care until someone blows the horn on them sort of like the Google Adwords Class Action Lawsuit.
The data is looking VERY fishy to me. Not sure if it is a coincidence with the Facebook IPO but I wouldn't rule out the possibility of Facebook trying to pad their ad revenues so the figures look better when they try to report them to the public for the first time.
We have the same products advertised on Google Shopping and the overall conversion rate is about 20+ times higher than Pricegrabber. Even Nextag has significantly higher conversion than Pricegrabber although much lower than Google. We dumped Shopzilla a long time ago due to declining ROI. Are these price comparison engines trying to get "creative" to stay alive considering most people use Google Shopping for comparison and with algo changes on Google burying these guys, they have lost a lot of exposure in recent months/years?
Who knows what is going on behind close doors in the name of greed?