badtigger - 7:26 am on Jun 8, 2005 (gmt 0)

totter: those are good ideas, and much better than what we have now. My question is with suggestion #2:
why aren't they doing this already?

The answer can only be (as you implicitly suggested) that scraper sites actually control inflation of advertiser's costs to a substantial degree.

So then, economically, they are good for the Adsense business model; ethically, they are bad for the consumer. (Users annoyed with all the dupe, spammy or robotic content might/will migrate to Yahoo, or another SE which doesn't have this problem.)