What's with the affiliate link (littdidd-20)?

I'm genuinely curious to know why people have a problem with affiliate links.

If it doesn't harm you, and the info is good, why begrudge someone their tiny percentage cut?

I'm not particularly bothered by this case (or more affiliate links), but when I see them in a blog post saying "This article / service is awesome, buy it", and there's an affiliate link involved, I do generally think "Yeah and how much are you making for saying that?"

But then I've done the same affiliate link stuff on occassion myself, especially when there's a perk link extra free space - it's easy to do, and as you say, not any harm as long as the intention isn't to mislead.

It's copied from his Xmas wishlist, Amazon probably put it there automatically.

The company mentioned in the article seem to have comparable ones but are cheaper.