Dear Evgeny,
Although an excellent software is impossible not to note that the large gap of KBPublisher in relation to other products on the market is the fact of being free.
There is a free software community interested in studying the problems and bugs in the product and make it increasingly accepted in the market. And this effervescence of discussions generates a continuous development for the product. Closing the code in version 3 and making it commercial will be gradually destroying all this creative potential of the community a product that naturally seek alternative because it is true that you will not be able to care for the paid version and the commercial. Who currently uses KbPublisher besides liking of the software is the philosophy of not paying licensing but only services. The niche market is this. Imagine if the community that created the Apache make the code closed. Naturally there will be a rejection and the search for an alternative product. For this appeal to review the position to make new versions trade because this type of initiative can have the opposite effect of undermining the use of KbPublisher. Linus Torvalds, Rasmus Lerdorf, Phil Zimmerman, among others, chose the path of free software, nor why not successful professional.
Whether or not the maintenance of its decision to make the new versions wait by commercial success and thank, now, this excellent product produced by you which is patrimony of humanity.
Carlos