Simples Assim

There’s always been a tacit assumption that it’s not really viable to take this route, because the open source company simply has too much of an advantage through its ownership of the copyright, and the fact that it can always incorporate any code produced by a fork into the commercial variants.

The latter is a better argument than the former.

http://linuxjournal.com/content/who-owns-commercial-open-source-%E2%80%93-and-can-forks-work