Sites targeted to buyers with good content are probably good.
The rest, especially when loaded with content (if any) of doubtful quality, usually one-sided or totally misleading are just that - doubtful and misleading.
The sites that have it should really discontinue their contributors part of referral programs. And when doing that, they could raise their commission payed to owners of the content to account for the savings they would have for payed out referrals.