Pretty much true.
They do however potentially provide useful content if and ONLY if they can be shown to present unbiased results to the consumer.
In the case of comparison sites, useful content would be content that helps rather than misleads the consumer.
So a site which
- uses a wide range of shopping sites for source data
- ranks products fairly (e.g. cheapest first - rather than 'site which gives comparison site web master most affiliate income first) - preferably including info on shipping costs too
- clearly indicates which listings the webmaster is getting affiliate income for
Could be considered for a listing.
Whereas a site which has one or more of the following characteristics:
- has a fairly limited database
- doesn't include all info relevant to the consumer
- doesn't rank fairly on price
- tries to hide/cloak any PPC/affiliate relationships of webmaster
Would not be.
HTH
Andy
PS This is the main reason most affiliate sites are rejected in 'recommendation' type categories. They recommend poor quality products to the consumer and don't consider enough different products. This probably happens because the companies that make poor products, know their products are rubbish and thus pay higher affiliate referral fees.
This gets even worse if best product in a category is free. (This is mainly relevant to computer software.) An affiliate driven site will never get income from recommending free software. Yet if free software is the best, and they aren't recommending it.. then they aren't being fair to their site visitors. And we won't list sites that don't offer an objective view