Referral Evidence of Yahoo Human Judging?

Followed by Increase in Traffic

[venti]

We use adsense on some of our sites and use the allowed sites tool option. The tool will report sites that are showing your adsense that have not been approved. Typically they are just cached pages on the various search engines, but we found a couple interesting ones from yahoo and wondered if anyone has any insight:

rtjudging3.yst.corp.yahoo.com
rtjudging2.yst.corp.yahoo.com
rtjudging1.yst.corp.yahoo.com

rtcatalog3.yst.corp.yahoo.com
rtcatalog2.yst.corp.yahoo.com
rtcatalog1.yst.corp.yahoo.com

I found a few referrers in my logs coming from these addresses and they all whois to Yahoo. The referrer is very interesting as well:

[rtjudging3.yst.corp.yahoo.com...] phrase&test_id=12345&galaxy=12345_space

It looks like this could be some sort of human "judging" going on at Yahoo? We have just started seeing this in the past month (newish site) and have seen an increase in Yahoo traffic during this same time (up many times fold). I believe that we may not always see a referrer in our logs because they are hosting our content on their servers (as is reported by adsense) and we would only see it in the logs if they clicked a link.

[bwnbwn]

[webmasterworld.com...] Seems this has been around for years but nobody has answered a thread on it yet
[webmasterworld.com...]

[foxtunes]

Just got exactly the same referral.