It's my computer, not yours. If you want to run software on it, I get to see the source code, that's the deal. We could agree that I can't use your software under these terms, but this would exploit those who don't understand the value of the source code. This is how spyware is born. If it runs on my machine, it's open source, or it's bunk.
And, once again, you can sell open source software.
And, once again, you can sell open source software.