I think it is a good idea to imply that personal development can also apply to smart people, because there is a huge number of people who believe that only naive people read "self help books". Many believe that reading such books equates to letting someone else tell you how you should spend your time etc. It's hard to reason with those people, although they may be quite reasonable in general, and quite successful themselves in teaching others how to be successful.
I don't think an accomplished author and expert should worry weather using the right words will have a negative effect on his sales, but should instead insist on using the right words to convey his message. There is always the danger of letting the audience influence the writting of a book, and when that happens, authors don't only write what is good for the people, but what is easy to sell.
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