Hanging a light on potential bias builds trust with the reader. He may have linked to the best parts, but how do I know that he didn't pick the parts that make him the most in referrals? You have to trust the author or usefulness of the information is compromised.

BTW, I'm not saying the author is taking advantage of his readers nor am I saying he has an obligation to disclose his referral links. I'm just pointing out the difference that it would make and suggesting that all bloggers consider it.

I just assume everyone in life has bias and that the links he provides my not make him much money or cover his costs of hosting.

I think that anyone going down the route of building a PC is going to do additional research and would be happy just to use posting as this as guidelines or starting points.

Just pointing out that those are two very large assumptions. It's just as likely that people are not as well read and will take things at face value.

Like the CODE keyboard which got a lot of attention but is really just another keyboard sold by WASDKeyboards.com.