Lame_Wolf - 4:25 pm on Mar 2, 2011 (gmt 0)
I do share your opinion that admittance to the program should be more stringent and require a quality web site in terms of content and design (not necessarily super pretty but at least usable), like most other top tier ads companies, I just think that basing it on what you think is decent traffic is not applicable to all topics. I'd be very happy to see cheap, freely hosted blogs with plagiarized content go away though. I'm tired of chasing after content thieves and I think it cheapens the Adsense brand, contributing to lower CTR.
As Google knows more about the markets etc than we do, they may want to do it per niche.
For example, a car site may need 2000 visitors a day. A lawyer site may need 300, a jewellery site 800, a news site 4000 etc etc.