I just started implementing some affiliate offers to my blog. And I agree that you have to find the balance of offering something to your readers without being too pushy or like what you said without selling your soul haha. For me sine my blog is about travel i just mention where I stayed or what hotel and if I liked it and I recommend it I put an affiliate link.
Affiliate marketing overlaps with other Internet marketing methods to some degree, because affiliates often use regular advertising methods. Those methods include organic search engine optimization (SEO), paid search engine marketing (PPC – Pay Per Click), e-mail marketing, content marketing, and (in some sense) display advertising. On the other hand, affiliates sometimes use less orthodox techniques, such as publishing reviews of products or services offered by a partner.