I would say true for most affiliate sites that are just aggregating the available options.

However, there are certainly sites, and perhaps this is one, where there is considerable credibility (actual interest and knowledge), research and effort that I have no problem with the owner being compensated for providing the resource.

Even if just providing a more intuitive and deeper method to narrow down options to fit a narrower use case (which vac has the longest cord!), then there is added value.