Amazon and A9 discount

Weird, i get a ~1.57% discount at amazon for having an A9 account that I “use”.

since you’ve been using A9.com recently, virtually everything at Amazon.com is automatically an additional π/2% (1.57%) off for you. Collecting this discount is zero effort on your part. It will be applied automatically at checkout (it will happen whether you use the shopping cart or our 1-Click Shopping®). You don’t need to do anything to get this discount except keep using A9.com as your regular search engine.

It goes on to say they’re not advertising this fact and that I should tell my family about it.