This is purely Smart Pricing algo updating blue sky speculation.
My niche products are expensive and bespoke, anywhere from USD 2,000 to 50,000.00 is considered normal for retail sales, however it is not possible to evaluate advertisers' landing pages for successful sales because no one, and I mean no one, in my retail industry can give an accurate price without much further detailed and niche trade-required information.
Do you send traffic to these type of informational sales-brochures sites or to ecommerce sites?
As I wrote, this is merely speculation just to see if there is a common denominator amongst those of us hit this last couple of months?
Did a Smart Pricing update decide that publishers who send traffic to non-ecommerce sites have their click values etc devalued?
Are we getting more discounted clicks because of the type of traffic we send?
Evidentally something happened regardless of what ASA says, any other ideas?