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Shameless Promotion: Just sayin'
I will probably never understand how someone can possibly expect anyone to buy their books when even a one-paragraph blurb is almost illiterate.
Let's reiterate this for the ten thousandth time: The first example of your writing anyone is going to have is the blurb you write for your book or books. If that is not letter-perfect, if it is filled with bad spelling, punctuation and grammar, how in the world can you expect anyone to think that your book is written any better?