Why is Google blocking shopping results in the US for vitamins?

Google Shopping has moved to a paid inclusion model, and it looks like no one in the vitamin sector has paid...

Here's Google's May 31st announcement on the change: http://googlecommerce.blogspot.com/2012/05/building-better-s...

Huge opportunity here for somebody to jump in and make giant piles of money through an affiliate network. Outside of membership programs vitamins and "health" goods have crazy affiliate payouts.

Didn't google lose a huge lawsuit about something to do with online pharmacies not too long ago? My guess is it's something to do with that.