google is crazy, page counts change drastically day to day, thats what causes the weight problems link vault you have to wait like 6 months to get vaultage, you get way less links for the amount pages you put the code on
The problem is Google is whacked. The amount of pages in the G index changes daily. I personally have not seen a really deep crawl from Gbot in a while. I think Google has serious Big Daddie issues going on. Also there have been reports they are running out of server storage. http://blogs.zdnet.com/web2explorer/?p=173