To be fair, that's a problem with a lot of unlicensed books about Star Trek (especially academic books, although this is not one of those).
Given the money they raised, though, you'd think they could have either (a) commissioned a more grabbing cover design or (b) licensed a photo from the series. I mean, Inside Star Trek: The Real Story
just has an image of the Enterprise on the front, but that is infinitely more grabbing (and specific) than this. Then again, perhaps licensing a photo like that for the cover would still be cost-prohibitive. I really don't know.