http://en.wikipedia.org/wiki/AdSense

Best I can tell based on the link the OP gave is the ratinghq.com site is already a google adsense user, and trying to get more ppl signed up by offering to 'split 50%' of the profit. What the link I provided says about adsense is that you don't need to go through another website, just use your own, and keep 100% of the profits from the clicks.

Either way they both sound like a scam and not something I'd be interested in doing at all.

Also, a review on that rating site has already been discussed on PT.http://petoftheday.com/talk/showthread.php?p=2051177 and it was a scam.