Decline in AdSense Ad Quality

Is adSense a victim of Internet opportunists?

[xonio]

Having been with AdSense for over the last 1.5 years, I'm definitely noticing a trend of low quality ads in AdSense. In my area, a good 50% of ads belong to "made for AdSense" sites which basically offer zero utility to a visitor and I believe thay pay a minimal amount for clicks. With such high percentage, I wouldn't blame visitors for turning blind to AdSense ads. This, in turn, will discourage serious advertisers to participate or at least drastically reduce their AdSense prorams and payment. A vicious cycle that does not help Google or siteowners. The only (short-term) winners are the AdSense opportunists
Even more than fraudulent clicks I see this trend as detrimental to AdSense. And yet, Google seems to not recognize or do anything about this trend.

[jetteroheller]

There is an URL filter.

Ebay, Overture and general affliants ads are easy to put in the URL filter.

Difficult are pages attracting ads from MLM people.
This is like the fight against the Hydra.
You cut one had, two others are growing.

Now at 64 lines in the filter

[fezziwig]

The these leeches were born to be filtered out.

[walrus]

Absolutely!
There is always talk about the quality of sites adsense is displayed on yet the advertisers seem to have no standards to adhere to.
I read a post recently about smart pricing,
(A good idea but apparantly subject to abuse )and it seems if you run a website with cruddy products which naturally produce low conversion, you can get a discount.
I hope that Adsense tracks smart pricing discounts given repeatedly to the same advertisers so they may at one point say, hey your product just isnt good or presented well, so you will have to pay full price.