I think the oct 22 update was intentional on google's part... because it would do 2 things:
1 - it will draw more clicks on the ads since the results are poor.
2 - it will also induce the store owners to start with ad campaigns then only relying on the SERPs.
Like my company, as soon as they knew that serps got hit.. we started with an AD Campaign.. so did we fall prey?
dont be evil google.