As LSI and over-optimization penalties become more obvious in the SERPs, I think that sometimes having a little bit of knowledge in this area can be a dangerous thing. I would agree that it is essentially a manipulative practise, whichever way you look at it, however that is not to say that businesses should not capitalize on it.
In much the same way as companies publish reports to gain brand exposure, and tie them into their products and services, SEO copywriting is merely a means of ensuring that you get your message across. I would say the best way to ensure that you do not cross any ethical boundaries, is to make sure that visitors can find helpful information that relates to the search queries that you are optimizing for.



