tristanperry - 6:57 pm on Feb 27, 2011 (gmt 0)
1) Personally I'd go on quality of the site instead of online time. There's some 1-11 month old sites which give more value than thin sites which have been online for possibly years.
2) Some niche sites might be massively useful but due to only having a small target market, might not be able to get around 50,000 monthly visits. Or it could be a really useful new site, which hasn't yet built up its traffic. Which ties into 1) above.
4) Some blogs use 100% unique content and images too, though. Perhaps there could be some sort of automated scan (independent of the way the website is handled - i.e. blog, CMS, by hand) that checks to see whether a site has lots of images which are externally linked, and could raise a flag on the AdSense team's end, though?
6) Having customer service would be a start ;-)