PPC Campaign Productivity - Is It Dropping For Anyone Else?

It seems like this time last year, when i was running PPC ad campaigns on places like Google, MSN, Yahoo, Kanoodle, etc the CTR to sales ratios were MUCH higher than they have been int he past few months.

Has anyone else noticed a significant drop in sales from their PPC campaigns over the last 3 months at all or is it just me?

I know Google quality has been going down the tubes for a while and im almost to the point where im considering dropping them completely but, now it appears the other pay for play engines im using are also starting to take a hit in the quality of traffic they are sending too :(

Regards,

Lee