Also, I'm including both book reviewers and book bloggers. Not everyone is both, but I'm sure most of us are book reviewers.
So, here are the reasons I believe book bloggers/reviewers would make AWESOME authors:
Just like poetry, calligraphy, or any type of art, reviewing is a way to express your feelings. You must find a way to express your opinions and emotions into words. Hence, each person, at least after a certain amount of time, develops their own style and tone in reviewing. This is a necessary quality for all writers - and it truly is a sign of talent when you can create words and phrases and reviews from muddled thoughts. And each reviewer/blogger is unique in how they accomplish this.
Obviously. *flips hair* Like Stephen King says, in order to be a good writer, you must read a variety of books.
Let's be honest here: there are hundreds, maybe thousands, of book bloggers from all around the world. All of us want to stand out from the crowd and we crave individuality and originality (if I weren't a book blogger I'd totally be a rapper). We do this by being inventive. I mean, look at all the brilliant memes out there, the clever and unconventional reviews: how did we get there? Creativity, yo.
Authors, if there's a historical inaccuracy in your book, you can bet your mother's teddy bear that somewhere out there a reviewer has caught said inaccuracy and is raging about it on Goodreads (I know because I've done it before). We can catch plot-holes and clunky writing as easily as we can spot a book sale at Barnes & Noble. If we know what makes a book bad, (completely subjective, I know) then it's not a big leap to assume we can catch all this in our writings.
I know you're supposed to write what YOU want to write, and I'm a firm believer in this. But we spend so much time discussing books with other bloggers that we get a general feel of what's a no-no and a yes-yes (like insta-love, for example).
I might not comment on other blogs as much as I'd like to, but I do dedicate a considerable number of hours weekly browsing the book blogosphere. And you know what that means? I'm more exposed to ideas, creativity, writing, which all boil down to one word: inspiration. (I am NOT condoning plagiarism, that's baaaad.) Every author has a source or two or whatever for inspiration in their writings. On top of that, reading other pieces of writing improves one's own writing - we learn from each other and that, my friends, is how you become better.
That said, if any of you guys ever publish a book, I'd definitely buy it.