ken_b - 5:54 pm on Mar 18, 2010 (gmt 0)
If one thinks about it, the idea that Google would give away your inventory to make less money doesn't make sense at all.
Here's my speculation on this.
I don't think they'd do that intentionally. But this stuff isn't done manually. It's some program making a "best guess" at what will work on a class of sites.
That means it's pretty much aimed at the lowest common denominator, so it will work well on many sites, but it works better on some sites and works worse on others.
If a site happens to fall into the "works worse on others" category Google isn't likely to to do much about it. It's probably those sites that wholesale blocking works best for.