If no effort has gone into the blurb(and everything else that meets the eye immediately, like the title), there's not really anything that can make me give the sample a try.
Don't get me wrong, I'm horrible at writing interesting blurbs, but I know how to write correct English. A single typo can happen and be overlooked(I cringe when I think about the first time I received a paperback copy of my first book and a word had accidentally been deleted from the blurb), but no proper writer would forget to capitalize the first letter in a sentence or a name.
So yes, bad blurbs would certainly prevent me from buying a bad book on impulse. As someone else wrote, it's a time-saver!
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