I feel like if you have 98% only affiliate content and no other valuable content it’s more likely to be penalized. I was following a lot of competitor sites in Ahrefs and noticed all the ones that tanked had only thin affiliate content and no non-affiliate content. For some reason I thought FixYourSkin was yours but I was wrong. That site went down like crazy and lost their traffic by half. I saw them trying to recover by adding more quality content but it doesn’t seem to help for them and it’s not helping me either.
If affiliate marketing on your book blog is your strategy to get rich quick, you, my friend, are in for a rude awakening. In my early days of blogging, I once received a cheque from Amazon for something like 42 cents. Not even kidding. (I still have it somewhere, and when I’m back in Perth next week, I’ll find it and post a pic.) Since then, both Lectito and my readership have grown, and I’ve built up a reasonable archive of posts that contain affiliate links. A year and a bit after starting Lectito, I’m making about $20 a month from affiliate marketing, and that’s mostly because a few of the links have higher commissions attached. I know:

Oh! I’ll add this – if your individual site or blog is applicable, All Posters has an outstanding affiliate program. I get healthy payments from them each month. They have more than just posters – they have art prints, wall murals, t-shirts, wall decals, etc. A lot more people order these online than you’d imagine. I wouldn’t give them up for anything.
Betfair Affiliates is the affiliate marketing program for the well known Betfair betting website. Betfair’s primary market is sports betting. It’s actually a betting exchange, so it allows gamblers to place lay bets too – in other words, bets that bank on the opposite outcome. Betfair also offers in-play betting that allows users to lock in profits before the match ends. They also have great offers for the new customers to Betfair Casino.
Many affiliate programs run with last-click attribution, where the affiliate receiving the last click before the sale gets 100% credit for the conversion. This is changing. With affiliate platforms providing new attribution models and reporting features, you are able to see a full-funnel, cross-channel view of how individual marketing tactics are working together. For example, you might see that a paid social campaign generated the first click, Affiliate X got click 2, and Affiliate Y got the last click. With this full picture, you can structure your affiliate commissions so that Affiliate X gets a percentage of the credit for the sale, even though they didn’t get the last click. 
Generally speaking, we recommend keeping your site focused on one niche. Otherwise you'll confuse your readers and hurt your brand. You're better off with separate sites for separate categories The exception to this might be if you promoted SEO/web hosting/other digital products that would aid people from your primary niche (say, dog training for example) who want to build their own businesses using affiliate marketing. There needs to be some sort of clear connection about how the products and niches relate.

After successfully launching their Australian affiliate program with Rakuten Marketing, Cotton ON utilized their affiliate program as a key channel for their strategy to expand to new international markets. Through the Cotton ON Australia program, publisher partnerships in the key markets of Hong Kong, Malaysia and Singapore are accessed, with a bespoke US affiliate program being managed by local US account managers.
When using affiliate links, the blogger also has control over where these links appear and how they look. Brands that offer affiliate partnerships typically provide a range of banners and titles for affiliates to use and contact affiliates when they have new creative to promote special offers, events and sales. However, you can also include simple text links on your site and EDMs and direct links in your social media posts.
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