I am really rooting for understandable software. I do not consider a software without appropriate documentation to be free (as in freedom). Lately I met many c

I am really rooting for understandable software. I do not consider a software without appropriate documentation to be free (as in freedom). Lately I met many companies claiming they make "open source", when their software is in fact hardly usable as is, and you would anyway be required to upgrade to "pro" features or "pro" support to get anything useful done with it. At this point I consider such piece of code de facto closed source. Disclosing the sources or part of them in itself does not bring much value and does not increase the number of careful eyes auditing the code. I really wonder why they decided to open-source such product to begin with, is it marketing? Are there other advantages?