The end of MFA sites?

Google recently decided to give Adsense a spring cleaning in Adsense and notified MFA (made for Adsense) sites, their account will be deactivated as per June 1st.
Apparently Google decided to do so after many of his clients and end users complained about “parasite” sites that did not bring anything in terms of customer experience.
What are MFA sites? They are pages created to support Adsense campaigns, they usually have little or no content at all and heavily contribute to web pollution. A good example would be http://www.cosmeticsurgeryguide.net/cosmetic-surgery.html , when you search for cosmetic surgery on Google, they appear in the sponsored link section.

These sites can be really profitable (even if unethical) for their owner some of them claim to earn more than $10,000 a month.
This decision from Google will have at least one good effect on your campaign as it will potentially decrease paid search cost. By filtering those sites, Google will leave the Adsense program to “good” sites and so your ads will not appear on site listing as it used to.