[tokyoSurfer]

Depends. They might want to to get you to come back and write a review/buy additional stuff.

On the other hand, this could be an affiliate that tries to generate any click so he gets a commission on your further purchases.

[unclebucknasty]

Whether it's Amazon wanting a customer to take additional action or an affiliate trying to drive traffic, relevant retargeting is much more effective than non-relevant.

And from the affiliate's perspective, interfacing to good retargeting is just as easy as interfacing to bad. That is, it's a black box owned and managed by Amazon.