I spent about 3,000 hours over 5 years writing the content on my site asking nothing in return. The affiliate sales on my site help pay for hosting and I don't think it's scammy to drop them in when it applies. I also think it would be a little weird if I started every article that has an affiliate link with a 5 paragraph disclaimer to justify why I am using that link, but maybe I should write a post about that and then drop a 1 liner link somewhere.
Literally opening a lemonade stand as a grown man would be more profitable than what I make on affiliate sales on my site if you factor in hourly rates.