The importance of a good and well written documentation can never be overemphasised. The detailed aspects of documentation about a particular subject, product or program will always drive either sales of such products or the adoption of such programs or languages. Reason being that at a first glance, documentations should be able to pass on basic understanding about the subject matter. That is the sole purpose of a documentation. It's not just enough to create a product to push into the market, you have to calm down and make sure the documentation of such product should be precise and hit every core usefulness of that product. The market will always be willing to buy, but the market will only buy what it feels it needs, and the documentation is supposed to show the market why they need that product. Don't aim to make the market "want" a product rather aim to make the market "need" that product.