Documentation and customizations
Money from the sale of manuals and customizations pays for new releases and development of new features.

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Free documentation
There is lots of free stuff available in the form of howtos and instructions. The installation instructions are also freely available, we also help to get the software installed. How to create a new set of translation files is documented in the Contributor's page. the concept of the API is also freely available.
Community based documentation
does exist to some extent. It should be noted that some of the things you'll find does not indicate a version number and if it isn't something generic it is of very little value. It is not our job to check wikis and inform others to correct mistakes.