I don't think you know much about Richard Stallman. He has no problem with people charging for software, indeed a right to commercial use is one of the fundamental software freedoms he enumerates.
Ironically, many Free Software/open source "supporters" are more hypocritical than Stallman. The thing that these people care most about is that the software is gratis. When it is not gratis but still open source (this is possible given the Free Software and Open Source definitions) these people scream fire and murder.