[Hi! This is a very old article, and we're just leaving it up here as a bit of history. In its very early days, Leanpub was more focused on people converting their blogs into books than we are now! - The Leanpub Team]
That's true: many blogs are of no interest to anyone but their creators. Most diaries fall into this category. However, even diaries can be of interest if they are well-written. More generally, many blogs are really either collections of essays or contain 1 or more in-progress books in them. For example, Paul Graham's Hackers and Painters is a well-regarded book, which is a collection of essays which were originally published on his blog. In the Leanpub example, both Startup Lessons Learned and Venture Hacks are good reading, even though they were produced with no editing by their authors at all. However, we don't think that most Leanpub books will be produced with no editing. Instead, we expect that authors will import their blogs as a starting point, and then go through the process of "curating" their posts: deleting the "I just had a great lunch" type of posts, and editing, rearranging and expanding others. At the end of this process, you have a manuscript. The great thing is that you get to sell as you go, and get real feedback from readers (as well as money)...
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Interested in creating your first Leanpub book? Here are some quick tutorials for our most popular writing modes: http://help.leanpub.com/en/articles/3088382-quick-walkthroughs-for-getting-started-on-a-leanpub-book