Is it spam to write five posts that focuse only on products i want to sell through an affiliate program?

Let's say i have a blog about psychology, and i write ninety five posts about psychology, with real information, but five out of hundred posts write solely on psychogloy books written by psychiatrists? is this a problem with google? because if you write a blog that only writes about products you want to sell,... show more Let's say i have a blog about psychology, and i write ninety five posts about psychology, with real information, but five out of hundred posts write solely on psychogloy books written by psychiatrists? is this a problem with google?
because if you write a blog that only writes about products you want to sell, wordpress will shut down your blog, that's what i heard.
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