Well, Google has really abandoned that whole Do No Evil thing they were so proud of. There are posts >here, >here, and >here that seem to be a trend.

The following types of websites are likely to merit low landing page quality scores and may be difficult to advertise affordably. In addition, it’s important for advertisers of these types of websites to adhere to our landing page quality guidelines regarding unique content.

eBook sites that show frequent ads
‘Get rich quick’ sites
Comparison shopping sites
Travel aggregators
Affiliates that don’t comply with our affiliate guidelines

In other words Google is going to charge them extra for their keywords? I’m glad about the get rich quick stuff and don’t even disagree with affiliate websites so much, but comparison shopping sites and travel aggregators?

Does google getting into >shopping comparisons and >travel have anything to do with it?

Does the fact that >Google is about to compete with Commission Junction with their own Affiliate program have anything to do with it?

Google may as well go ahead and get into the get rich quick schemes too.