I think this makes sense for a lot of people here, and that people will be able to sell books on Kindle store writing like this, but it is surely sad that writing has become this nowadays.
Why do you say that?
Writing is practice. The act of writing itself is one of the best ways to improve writing. Which is why so many writers stress the importance of regular writing, and not so much that you always have to be doing quality writing.
If this site, and its prompts, encourage folks to write regularly, then that can only be a good thing.
(Maybe I didn't make it clear - the purpose here is not to "sell kindle books", but to practice writing skills. Not to generate as much content as possible, but to get better at your craft.)
Writing has the function of tangible thinking as well, it is when one is writing that we realise we think in certain ways or that we don't know certain things as we imagined.
For me, this would help in forcing me to write something without waiting for the perfect sentence to form in my mind.